Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plan - Additional Information (Details)

v3.21.1
Equity Incentive Plan - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2010
Jan. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding And Exercisable Intrinsic Value $ 0 $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 130,865 75,665    
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 24 days 2 years 4 months 13 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 829,000 $ 489,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 6.33 $ 6.46    
Sharebased Compensation Arrangement by Sharebased Payment Award Equity Instruments Other than Options Granted in Period Fair Value $ 1,389,000 $ 1,267,000    
Number of Options, Granted 130,865 75,665    
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 33.00%      
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 67.00%      
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%  
Holders Owing More Than Ten Percentage Voting Rights [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, Award Vesting Period     10 years  
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 606,005     606,005
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 69,521      
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 233      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   49,000    
Restricted Stock | 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 33.00%      
Restricted Stock | 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 67.00%