Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Narrative (Details)

v3.20.1
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, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation     $ 1,306 $ 1,313  
Weighted average fair value of stock options issued     $ 1.55    
Options outstanding (in shares)     1,806,508 2,001,008 2,315,035
General and Administrative Expense.          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation     $ 1,300 $ 1,300  
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     2 years 6 months    
Restricted shares outstanding     150,000    
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of options vested     $ 300 500  
Options outstanding (in shares)     579,402    
Unrecognized compensation cost related to milestone based options     $ 700    
Unrecognized compensation cost related to non-vested awards     $ 300    
Unrecognized compensation cost, recognition period     2 years 9 months 18 days    
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)     2,583,283    
Equity Incentive Plan 2019 [Member]          
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     $ 200 $ 100