Related Party Transactions - Additional Information (Detail) - USD ($) |
1 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 13, 2015 |
Jul. 26, 2016 |
May 31, 2016 |
May 31, 2015 |
Mar. 20, 2015 |
Mar. 17, 2015 |
Feb. 17, 2015 |
Sep. 30, 2014 |
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
Jul. 30, 2016 |
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| Related Party Transaction [Line Items] | |||||||||||||
| Costs and Expenses, Related Party | $ 21,000 | $ 44,000 | $ 84,000 | $ 88,000 | |||||||||
| 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 Mustangs 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 Mustangs 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 Helocytes 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 Helocytes 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 Checkpoints 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 Checkpoints 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 Avenues 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 Avenues 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 | 249,000 | $ 0 | |||||||||||
| Prepaid Rent | $ 199,000 | ||||||||||||
| Lease Sharing Agreements, Contributions to Property Under Lease | 4,500,000 | ||||||||||||
| Chord Advisors, LLC [Member] | |||||||||||||
| Related Party Transaction [Line Items] | |||||||||||||
| Related Party Transaction, Expenses from Transactions with Related Party | $ 10,000 | ||||||||||||
| TG Therapeutics, Inc [Member] | |||||||||||||
| Related Party Transaction [Line Items] | |||||||||||||
| Operating Leases, Rent Expense | $ 1,100,000 | ||||||||||||
| Prepaid Rent | 79,800 | 79,800 | |||||||||||
| Due from Related Parties, Current | 2,000,000 | 2,000,000 | |||||||||||
| Percentage of Rentable Area | 45.00% | 40.00% | |||||||||||
| Lease Improvement Cost Associate With Lease | 5,100,000 | ||||||||||||
| 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] | Subsequent Event [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 Mustangs 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] | |||||||||||||
| Due from Related Parties | 500,000 | 500,000 | |||||||||||
| Operating Leases, Rent Expense | $ 500,000 | ||||||||||||
| Prepaid Rent | 39,800 | 39,800 | |||||||||||
| Due from Related Parties, Current | 500,000 | 500,000 | |||||||||||
| Percentage of Rentable Area | 10.00% | 20.00% | |||||||||||
| Lease Improvement Cost Associate With Lease | 5,100,000 | ||||||||||||
| 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 | ||||||||||||
| Shared Services Agreement [Member] | TG Therapeutics, Inc [Member] | |||||||||||||
| Related Party Transaction [Line Items] | |||||||||||||
| Proceeds from Related Party Agreement | $ 200,000 | $ 300,000 | |||||||||||