Related Party Transactions - Additional Information (Detail) - USD ($) |
1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 13, 2015 |
Sep. 30, 2016 |
Jul. 26, 2016 |
May 31, 2016 |
Apr. 27, 2016 |
May 31, 2015 |
Mar. 20, 2015 |
Mar. 17, 2015 |
Feb. 17, 2015 |
Sep. 30, 2014 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
Jul. 31, 2016 |
Jul. 05, 2016 |
Mar. 17, 2014 |
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| Related Party Transaction [Line Items] | ||||||||||||||||||
| Costs and Expenses, Related Party | $ 0 | $ 66,000 | $ 84,000 | $ 154,000 | ||||||||||||||
| Agreement Description Terms | (i) pay an equity fee in shares of common stock, payable within five (5) business days of the closing of any equity or debt financing for Mustang or any of its respective subsidiaries that occurs after the effective date of the Founders Agreement and ending on the date when the Company no longer has majority voting control in Mustang’s voting equity, equal to two and one-half (2.5%) of the gross amount of any such equity or debt financing; and (ii) pay a cash fee equal to four and one-half percent (4.5%) of Mustang’s annual net sales, payable on an annual basis, within ninety (90) days of the end of each calendar year. In the event of a change in control, Mustang will pay a one-time change in control fee equal to five (5x) times the product of (A) monthly net sales for the twelve (12) months immediately preceding the change in control and (B) four and one-half percent (4.5%). | (i) issue annually to the Company, on the anniversary date of the Founders Agreement, shares of common stock equal to two and one half percent (2.5%) of the fully-diluted outstanding equity of Helocyte at the time of issuance; (ii) pay an equity fee in shares of Helocyte common stock, payable within five (5) business days of the closing of any equity or debt financing for Helocyte or any of its respective subsidiaries that occurs after the effective date of the Founders Agreement and ending on the date when Fortress no longer has majority voting control in Helocyte’s voting equity, equal to two and one half percent (2.5%) of the gross amount of any such equity or debt financing; and (iii) pay a cash fee equal to four and one half percent (4.5%) of Helocyte’s annual net sales, payable on an annual basis, within ninety (90) days of the end of each calendar year. In the event of a change in control (as it is defined in the Founders Agreement), the Company will pay a one-time change in control fee equal to five (5x) times the product of (i) monthly net sales for the twelve (12) months immediately preceding the change in control and (ii) four and one-half percent (4.5%). | (i) issue annually to the Company, on the anniversary date of the Founders Agreement, shares of common stock equal to 2.5% of the fully-diluted outstanding equity of Checkpoint at the time of issuance; (ii) pay an equity fee in shares of common stock, payable within five (5) business days of the closing of any equity or debt financing for Checkpoint or any of its subsidiaries that occurs after the effective date of the Founders Agreement and ending on the date when the Company no longer has majority voting control in Checkpoint’s voting equity, equal to 2.5% of the gross amount of any such equity or debt financing; and (iii) pay a cash fee equal to 4.5% of Checkpoint’s annual net sales, payable on an annual basis, within ninety (90) days of the end of each calendar year. In the event of a change in control (as it is defined in the Founders Agreement), Checkpoint will pay a one-time change in control fee equal to five times (5x) the product of (i) net sales for the twelve (12) months immediately preceding the change in control and (ii) four and one-half percent (4.5%). | (i) issue annually to the Company, on the anniversary date of the Founders Agreement, shares of common stock equal to two and one half percent (2.5%) of the fully-diluted outstanding equity of Avenue at the time of issuance; (ii) pay an equity fee in shares of Avenue common stock, payable within five (5) business days of the closing of any equity or debt financing for Avenue or any of its respective subsidiaries that occurs after the effective date of the Founders Agreement and ending on the date when Fortress no longer has majority voting control in Avenue’s voting equity, equal to two and one half percent (2.5%) of the gross amount of any such equity or debt financing; and (iii) pay a cash fee equal to four and one half percent (4.5%) of Avenue’s annual net sales, payable on an annual basis, within ninety (90) days of the end of each calendar year. In the event of a change in control (as it is defined in the Founders Agreement), the Company will pay a one-time change in control fee equal to five (5x) times the product of (i) monthly net sales for the twelve (12) months immediately preceding the change in control and (ii) four and one-half percent (4.5%). | ||||||||||||||
| Debt Issuance Cost | 491,000 | 0 | ||||||||||||||||
| Lease Sharing Agreements, Contributions to Property Under Lease | 4,700,000 | |||||||||||||||||
| Equity Method Investment, Ownership Percentage | 35.00% | |||||||||||||||||
| Business Combination, Consideration Transferred | $ 22,872,000 | |||||||||||||||||
| National Holdings Corporation [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Business Acquisition, Percentage of Voting Interests Acquired | 56.10% | 56.00% | 56.10% | 56.10% | ||||||||||||||
| Proceeds from Fees Received | $ 1,300,000 | 1,300,000 | $ 1,300,000 | 1,300,000 | ||||||||||||||
| Business Combination, Consideration Transferred | $ 22,900,000 | $ 22,900,000 | ||||||||||||||||
| NSC Note [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Long-term Debt, Gross | $ 3,600,000 | $ 3,600,000 | ||||||||||||||||
| Chord Advisors, LLC [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Related Party Transaction, Expenses from Transactions with Related Party | $ 10,000 | |||||||||||||||||
| Board of Directors Chairman [Member] | National Holdings Corporation [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Equity Method Investment, Ownership Percentage | 4.60% | 4.60% | 4.60% | |||||||||||||||
| TG Therapeutics, Inc [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Operating Leases, Rent Expense | $ 1,100,000 | |||||||||||||||||
| Prepaid Rent | $ 180,000 | $ 180,000 | $ 180,000 | |||||||||||||||
| Due from Related Parties, Current | 2,600,000 | 2,600,000 | 2,600,000 | |||||||||||||||
| Percentage of Rentable Area | 45.00% | 40.00% | ||||||||||||||||
| Lease Improvement Cost Associate With Lease | 5,100,000 | |||||||||||||||||
| Checkpoint [Member] | NSC Note [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Debt Issuance Cost | 2,800,000 | |||||||||||||||||
| Checkpoint [Member] | Chord Advisors, LLC [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Related Party Transaction, Expenses from Transactions with Related Party | 7,500 | |||||||||||||||||
| Founders Agreement [Member] | Mustang Bio, Inc [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Lessee Leasing Arrangements, Operating Leases, Term of Contract | 15 years | |||||||||||||||||
| Agreement Description Terms | Concurrently with the second amendment to the Founders Agreement, we entered into an Exchange Agreement whereby we exchanged our 7.2 million Class B Common shares for 7.0 million common shares and 250,000 Class A Preferred shares. Class A Preferred Stock is identical to common stock other than as to voting rights, conversion rights and the PIK Dividend right (as described below). Each share of Class A Preferred Stock will be entitled to vote the number of votes that is equal to one and one-tenth (1.1) times a fraction, the numerator of which is the sum of (A) the shares of outstanding Mustang common stock and (B) the whole shares of Mustang common stock into which the shares of outstanding Class A Common Stock and the Class A Preferred Stock are convertible and the denominator of which is the number of shares of outstanding Class A Preferred Stock. Thus, the Class A Preferred Stock will at all times constitute a voting majority. Each share of Class A Preferred Stock is convertible, at our option, into one fully paid and nonassessable share of Mustang common stock, subject to certain adjustments. As holders of Class A Preferred Stock, we will receive on each March 13 (each a “PIK Dividend Payment Date”) until the date all outstanding Class A Preferred Stock is converted into common stock or redeemed (and the purchase price is paid in full), pro rata per share dividends paid in additional fully paid and nonassessable shares of common stock (“PIK Dividends”) such that the aggregate number of shares of common stock issued pursuant to such PIK Dividend is equal to two and one-half percent (2.5%) of Mustang’s fully-diluted outstanding capitalization on the date that is one (1) business day prior to any PIK Dividend Payment Date. | |||||||||||||||||
| Debt Instrument, Face Amount | $ 2,000,000 | |||||||||||||||||
| OPPM [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Operating Leases, Rent Expense | $ 500,000 | |||||||||||||||||
| Prepaid Rent | 37,000 | 37,000 | 37,000 | |||||||||||||||
| Due from Related Parties, Current | $ 600,000 | 600,000 | 600,000 | |||||||||||||||
| Percentage of Rentable Area | 10.00% | 20.00% | ||||||||||||||||
| Lease Improvement Cost Associate With Lease | 5,100,000 | |||||||||||||||||
| Collaboration Agreement with TGTX [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Payments for Fees | 0 | 25,000 | 20,000 | 500,000 | $ 500,000 | |||||||||||||
| Founder [Member] | Founders Agreement [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Lessee Leasing Arrangements, Operating Leases, Term of Contract | 15 years | 15 years | ||||||||||||||||
| Management Services Agreement [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Annual Consulting Fee | $ 500,000 | $ 500,000 | $ 500,000 | $ 500,000 | ||||||||||||||
| Increase in Annual Consulting Fee | 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000 | ||||||||||||||
| Excess In Net Assets Value | $ 100,000,000 | $ 100,000,000 | 100,000,000 | 100,000,000 | ||||||||||||||
| Management Services Agreement [Member] | Checkpoint [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Long-term Debt, Gross | $ 2,800,000 | |||||||||||||||||
| Management Services Agreement [Member] | Founders Agreement [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Debt Issuance Cost | $ 3,000,000 | |||||||||||||||||
| Avenue [Member] | Chord Advisors, LLC [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Related Party Transaction, Expenses from Transactions with Related Party | $ 5,000 | |||||||||||||||||
| Avenue [Member] | Founders Agreement [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Agreement Description Terms | Company entered into an Exchange Agreement whereby the Company exchanged its 7.0 million Class B Common shares for 6.75 million common shares and 250,000 Class A Preferred shares. Class A Preferred Stock is identical to common stock other than as to voting rights, conversion rights and the PIK Dividend right (as described below). Each share of Class A Preferred Stock will be entitled to vote the number of votes that is equal to one and one-tenth (1.1) times a fraction, the numerator of which is the sum of (A) the shares of outstanding Helocyte common stock and (B) the whole shares of Helocyte common stock into which the shares of outstanding Class A Common Stock and Class A Preferred Stock are convertible and the denominator of which is the number of shares of outstanding Class A Preferred Stock. Thus, the Class A Preferred Stock will at all times constitute a voting majority. Each share of Class A Preferred Stock is convertible, at its option, into one fully paid and nonassessable share of Helocyte common stock, subject to certain adjustments. As the sole holder of Class A Preferred Stock, the Company will receive on each March 20 (each a PIK Dividend Payment Date) until the date all outstanding Class A Preferred Stock is converted into common stock or redeemed (and the purchase price is paid in full), pro rata per share dividends paid in additional fully paid and nonassessable shares of common stock (PIK Dividends) such that the aggregate number of shares of common stock issued pursuant to such PIK Dividend is equal to two and one-half percent (2.5%) of Helocytes fully-diluted outstanding capitalization on the date that is one (1) business day prior to any PIK Dividend Payment Date. | the Company entered into an Exchange Agreement whereby the Company exchanged its 7.0 million Class A Common shares for approximately 7.5 million common shares and 250,000 Class A Preferred shares. Class A Preferred Stock is identical to common stock other than as to voting rights, conversion rights, election of directors and the PIK Dividend right (as described below). Each share of Class A Preferred Stock will be entitled to vote the number of votes that is equal to one and one-tenth (1.1) times a fraction, the numerator of which is the sum of (A) the shares of outstanding Avenue common stock and (B) the whole shares of Avenue common stock into which the shares of outstanding Class A Preferred Stock are convertible and the denominator of which is the number of shares of outstanding Class A Preferred Stock. Thus, the Class A Preferred Stock will at all times constitute a voting majority. Each share of Class A Preferred Stock is convertible, at its option, into one fully paid and nonassessable share of Avenue common stock, subject to certain adjustments. For a period of 10 years from the date of the first issuance of Class A Preferred Stock, the holders of record of shares of Class A Preferred Stock, exclusively and as a separate class, are entitled to appoint or elect the majority of Avenues Board of Directors. As holders of Class A Preferred Stock, the Company will receive on each February 17 (each a PIK Dividend Payment Date) until the date all outstanding Class A Preferred Stock is converted into common stock or redeemed (and the purchase price is paid in full), pro rata per share dividends paid in additional fully paid and nonassessable shares of common stock (PIK Dividends) such that the aggregate number of shares of common stock issued pursuant to such PIK Dividend is equal to two and one-half percent (2.5%) of Avenues fully-diluted outstanding capitalization on the date that is one (1) business day prior to any PIK Dividend Payment Date. | ||||||||||||||||
| Shared Services Agreement [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Proceeds from Related Party Agreement | $ 71,800 | $ 71,800 | ||||||||||||||||
| Shared Services Agreement [Member] | TG Therapeutics, Inc [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Proceeds from Related Party Agreement | $ 300,000 | 600,000 | ||||||||||||||||
| Desk Space Agreements [Member] | ||||||||||||||||||
| Related Party Transaction [Line Items] | ||||||||||||||||||
| Payments for Rent | $ 400,000 | |||||||||||||||||