Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Narrative (Details)

v3.20.4
Employee Benefit Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 04, 2019
Oct. 31, 2013
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation     $ 1,773 $ 1,306  
Weighted average fair value of stock options issued       $ 1.55  
Stock options, granted     0 68,000  
Options outstanding (in shares)     1,707,008 1,806,508 2,001,008
General and Administrative Expense.          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation     $ 1,800 $ 1,300  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of options vested     $ 200 300  
Options outstanding (in shares)     579,402    
Unrecognized compensation cost related to non-vested awards     $ 200    
Unrecognized compensation cost, recognition period     1 year 9 months 18 days    
Unrecognized compensation cost related to milestone based options     $ 700    
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to non-vested awards     $ 1,700    
Unrecognized compensation cost, recognition period     1 year 9 months 18 days    
Restricted shares outstanding     150,000    
Milestone-Based Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to non-vested awards     $ 400    
The 2013 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Contractual term   10 years      
Shares remaining available for issuance (in shares)     1,216,192    
Equity Incentive Plan 2019          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Increase in authorized shares (in shares) 2,300,000        
Authorized shares (in shares)     7,073,922    
Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation     $ 300 $ 200