Quarterly report pursuant to Section 13 or 15(d)

Debt and Interest- Additional Information (Details)

v3.19.3
Debt and Interest- Additional Information (Details)
1 Months Ended 9 Months Ended
Aug. 06, 2019
USD ($)
Jul. 18, 2019
USD ($)
$ / shares
shares
Mar. 29, 2019
USD ($)
D
installment
$ / shares
shares
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       2.50%  
Long-term Debt       $ 89,742,000 $ 84,406,000
Amortization Payments, Installments | installment     18    
Number of Business Days Prior Written Notice | D     10    
Debt Instrument, Periodic Payment, Principal     $ 500,000    
Percent of Outstanding Loan Principal Amount for Calculation of Repayment Change     4.00%    
Percentage Of Amortization Loan Date     3.00%    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate     2.00%    
Line of Credit Facility, Periodic Payment     $ 300,000    
Line of Credit Facility, Periodic Payment, Principal     800,000    
Proceeds from Lines of Credit     $ 15,000,000    
Accrued Interest Percentage     5.00%    
Cash       $ 9,400,000  
Percentage of Warrants Included in Debt     5.00%    
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares     288,184    
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 3.47    
Warrants Not Settleable in Cash, Fair Value Disclosure     $ 900,000    
Minimum [Member]          
Debt [Line Items]          
Cash     8,000,000    
Maximum [Member]          
Debt [Line Items]          
Cash     13,000,000    
Horizon Technology Finance Corporation [Member]          
Debt [Line Items]          
Legal Fees     1,200,000    
Line of Credit Facility, Commitment Fee Amount     200,000    
Reimbursement of Legal Fees     30,000    
Opus Credit Facility [Member]          
Debt [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       12.00%  
Long-term Debt       $ 9,000,000 $ 9,500,000
Common shares issued for Opus debt (in shares) | shares   396,825      
Common Shares Issued For Opus Debt, Issue Price | $ / shares   $ 1.26      
Line Of Credit Facility, Prepayment Amount   $ 500,000      
Extension period for maturity date of the credit facility 1 year        
Mustang Two Thousand Nineteen Venture Debt [Member]          
Debt [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity     15,000,000    
Line of Credit Facility, Current Borrowing Capacity     20,000,000    
Line of Credit Facility, Remaining Borrowing Capacity     $ 5,000,000    
LIBOR Rate [Member]          
Debt [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       9.00%  
Debt Instrument, Basis Spread on Variable Rate     9.00%    
Subordinated Note Financing 2017 One to Five          
Debt [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       9.00%  
Long-term Debt, Maturity Date Extension Term       1 year  
Long-term Debt $ 28,400,000        
Subordinated Note Financing 2017 One to Five | NAM Biotech Fund II, LLC [Member]          
Debt [Line Items]          
Long-term Debt 12,300,000        
Subordinated Note Financing 2017 One to Five | NAM Special Situations Fund I QP [Member]          
Debt [Line Items]          
Long-term Debt $ 16,100,000        
2018 Venture Notes          
Debt [Line Items]          
Long-term Debt, Maturity Date Extension Term 6 months        
Long-term Debt $ 21,700,000        
2018 Venture Notes | NSC Biotech Opportunities Fund, LLC [Member]          
Debt [Line Items]          
Long-term Debt 5,100,000        
2018 Venture Notes | NSC Biotech Opportunities QP Fund, LLC [Member]          
Debt [Line Items]          
Long-term Debt $ 16,600,000