Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.19.3
Debt (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]    
Interest expense $ 8,000 $ 8,000
Credit Agreement    
Debt Instrument [Line Items]    
Maximum borrowing capacity 60,000,000 60,000,000
Remaining borrowing capacity 50,000,000 50,000,000
Debt issuance costs being amortized ratably 211,000 211,000
Unamortized issuance costs and debt discounts 211,000 211,000
Accrued interest   7,000
Outstanding balance 9,800,000 9,800,000
Covenant, cash 10,000,000 $ 10,000,000
Final payment fee, percentage of principal   2.50%
Credit Agreement | Subject to achievement of certain customary conditions    
Debt Instrument [Line Items]    
Remaining borrowing capacity $ 40,000,000 $ 40,000,000
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 $ 10,000,000
Credit Agreement | until December 31, 2020    
Debt Instrument [Line Items]    
Maximum borrowing capacity 10,000,000 10,000,000
Credit Agreement | until March 31, 2021    
Debt Instrument [Line Items]    
Maximum borrowing capacity 20,000,000 20,000,000
Credit Agreement | until March 31, 2022    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 20,000,000 $ 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