Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.20.1
Debt (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
May 31, 2020
Debt Instrument [Line Items]    
Interest expense $ 142,000  
Credit Agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity 60,000,000  
Remaining borrowing capacity 50,000,000  
Debt issuance costs being amortized ratably 211,000  
Unamortized issuance costs and debt discounts 171,000  
Interest expense 241,000  
Accrued interest 62,000  
Outstanding balance 9,800,000  
Covenant, cash $ 10,000,000  
Final payment fee, percentage of principal 2.50%  
Credit Agreement | Subsequent event    
Debt Instrument [Line Items]    
Remaining borrowing capacity   $ 10,000,000
Credit Agreement | Subject to achievement of certain customary conditions    
Debt Instrument [Line Items]    
Remaining borrowing capacity $ 40,000,000  
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  
Credit Agreement | until December 31, 2020    
Debt Instrument [Line Items]    
Maximum borrowing capacity 10,000,000  
Credit Agreement | until March 31, 2021    
Debt Instrument [Line Items]    
Maximum borrowing capacity 20,000,000  
Credit Agreement | until March 31, 2022    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 20,000,000  
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