Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Details)

v3.19.1
Long-Term Debt - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Dec. 31, 2016
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]          
Long-term debt, net   $ 4,426,000      
Success fee $ 250,000        
Current share price (in dollars per share)         $ 8.00
Contingent success fee liability   35,000      
Debt covenant, unrestricted cash   4,908,000      
Cash   $ 9,236,000 $ 7,655,000 $ 20,572,000 $ 27,813,000
Effective interest rate percentage   10.47%      
Loan Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 7,000,000        
Debt term   36 months      
Long-term debt, net   $ 245,000      
Accretion of final payment fee of debt   $ 194,000      
LIBOR | Loan Agreement          
Debt Instrument [Line Items]          
Variable rate percentage 5.41%