Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plan - Additional Information (Details)

v3.20.1
Equity Incentive Plan - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 0 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 75,665 49,994  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     59,414
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years 4 months 13 days 2 years 2 months 9 days 10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 489,000 $ 355,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 6.46 $ 7.11  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0 2  
Sharebased Compensation Arrangement by Sharebased Payment Award Equity Instruments Other than Options Granted in Period Fair Value $ 1,267,000 $ 1,358,000  
Number of Options, Granted 75,665 49,994  
One-year anniversary [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.33%    
24-month period [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.67%    
Holders Owing More Than Ten Percentage Voting Rights [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     5 years
Holders Owing More Than Ten Percentage Voting Rights [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Percentage of Exercise Price     110.00%
Equity Incentive Plan 2014 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 582,672    
Equity Incentive Plan 2014 [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 582,672    
ESPP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 7,806    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 11,371    
2014 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 190,691    
Excess Stock, Shares Authorized 23,333    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 49,000 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 49,000