Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.20.2
Debt (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
May 31, 2020
Debt Instrument [Line Items]          
Interest expense $ 429,000 $ 8,000 $ 924,000 $ 8,000  
Credit Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity 60,000,000.0   60,000,000.0    
Remaining borrowing capacity 40,000,000.0   40,000,000.0   $ 10,000,000.0
Debt issuance costs being amortized ratably 236,000   236,000    
Unamortized issuance costs and debt discounts 164,000   164,000    
Interest expense 429,000   1,000,000.0    
Accrued interest     233,000    
Outstanding balance 19,800,000   19,800,000    
Covenant, cash $ 10,000,000.0   $ 10,000,000.0    
Final payment fee, percentage of principal     2.50%    
Credit Agreement | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate     5.65%    
Floor rate 1.50%   1.50%    
Credit Agreement | as of September 27, 2019          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 10,000,000.0   $ 10,000,000.0    
Credit Agreement | until December 31, 2020          
Debt Instrument [Line Items]          
Maximum borrowing capacity 10,000,000.0   10,000,000.0    
Credit Agreement | until March 31, 2021          
Debt Instrument [Line Items]          
Maximum borrowing capacity 20,000,000.0   20,000,000.0    
Credit Agreement | until March 31, 2022          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 20,000,000.0   $ 20,000,000.0    
Credit Agreement | Initial interest-only payment period          
Debt Instrument [Line Items]          
Interest-only payments period     24 months    
Credit Agreement | First conditional interest-only payment period          
Debt Instrument [Line Items]          
Interest-only payments period     36 months    
Credit Agreement | Second conditional interest-only payment period          
Debt Instrument [Line Items]          
Interest-only payments period     48 months