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Stock-based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Jul. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized (in shares)       7,150,000
Stock-based compensation expense   $ 0.9 $ 0.8  
Share-based compensation, nonvested awards, compensation cost not yet recognized   $ 3.5    
Period for recognition of compensation on unvested stock option (in years)   1 year 7 months 6 days    
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized (in shares) 500,000      
ESPP | Employee Stock Purchase Plan 2019        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Discount from market price, purchase date 15.00%      
Purchase period 6 months      
ESPP purchase price of common stock, percent of closing price 85.00%      
Shares issued (in shares)   314,117