Quarterly report pursuant to Section 13 or 15(d)

Liquidity (Details)

v3.20.4
Liquidity (Details) - USD ($)
Feb. 28, 2020
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
May 22, 2019
Mar. 31, 2019
May 23, 2017
Debt Instrument [Line Items]              
Cash   $ 43,659,000 $ 21,659,000 $ 33,879,000   $ 11,059,000  
New Credit Agreement              
Debt Instrument [Line Items]              
Remaining borrowing capacity   5,000,000          
Line of credit | New Credit Agreement              
Debt Instrument [Line Items]              
Debt face amount $ 5,000,000            
Outstanding principal   0          
Line of credit | Western Alliance Bank              
Debt Instrument [Line Items]              
Maximum borrowing capacity         $ 20,000,000   $ 5,000,000
Term Loan | New Credit Agreement              
Debt Instrument [Line Items]              
Debt face amount 20,000,000            
Outstanding principal   $ 19,250,000          
Term Loan | New Credit Agreement | Minimum              
Debt Instrument [Line Items]              
Principal payment 250,000            
Term Loan | New Credit Agreement | Maximum              
Debt Instrument [Line Items]              
Principal payment $ 1,250,000