Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.21.1
Debt (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
May 31, 2020
Debt Instrument [Line Items]        
Unamortized issuance costs and debt discounts     $ 185,000  
Interest expense $ 485,000 $ 142,000    
Credit Agreement        
Debt Instrument [Line Items]        
Maximum borrowing capacity 60,000,000.0      
Remaining borrowing capacity 40,000,000.0     $ 10,000,000.0
Unamortized issuance costs and debt discounts 156,000      
Interest expense 425,000 $ 241,000    
Outstanding balance 19,800,000      
Covenant, cash $ 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%      
Credit Agreement | as of September 27, 2019        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 10,000,000.0      
Credit Agreement | until December 31, 2020        
Debt Instrument [Line Items]        
Maximum borrowing capacity 10,000,000.0      
Credit Agreement | until March 31, 2021        
Debt Instrument [Line Items]        
Maximum borrowing capacity 20,000,000.0      
Credit Agreement | until March 31, 2022        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 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