Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Details)

v3.19.3
Long-Term Debt - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2016
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]              
Long-term debt, net   $ 3,305,000   $ 3,305,000      
Accretion of final payment fee of debt   11,000 $ 19,000 40,000 $ 64,000    
Success fee $ 250,000            
Current share price (in dollars per share) $ 8.00            
Contingent success fee liability   15,000   15,000      
Debt covenant, unrestricted cash   4,372,000   4,372,000      
Cash   $ 8,058,000 $ 12,995,000 $ 8,058,000 $ 12,995,000 $ 7,655,000 $ 27,813,000
Effective interest rate percentage   10.20%   10.37%      
Loan Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 7,000,000            
Debt term       36 months      
Long-term debt, net   $ 245,000   $ 245,000      
Accretion of final payment fee of debt       $ 218,000      
LIBOR | Loan Agreement              
Debt Instrument [Line Items]              
Variable rate percentage 5.41%