Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plan - Additional Information (Details)

v3.19.3
Equity Incentive Plan - Additional Information (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2010
Jul. 10, 2018
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 $ 830,000 $ 1,594,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 9 months 22 days 1 year 9 months 22 days    
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 49,994 27,687    
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     10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 355,000 $ 230,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 7.05 $ 8.30    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 79 0    
Sharebased Compensation Arrangement by Sharebased Payment Award Equity Instruments Other than Options Granted in Period Fair Value $ 0 $ 1,077,000    
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 559,339      
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       559,339
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 283,143      
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 7,659 3,349