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Stock-Based Compensation - Narratives (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
item
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
$ / shares
Stock-Based Compensation      
Number of equity incentive plans | item 2    
Aggregate intrinsic value of outstanding options $ 3.0    
Aggregate intrinsic value of exercisable options $ 2.8    
Restricted stock units      
Stock-Based Compensation      
Vesting period 4 years    
Weighted average grant date fair value, Equity Instruments (per share) | $ / shares $ 16.57    
Unrecognized compensation expense $ 1.6    
Weighted average period for recognition of unrecognized expenses 3 years 2 months 12 days    
2012 Stock Incentive Plan      
Stock-Based Compensation      
Weighted average grant date fair value, Options (per share) | $ / shares $ 8.66 $ 8.13 $ 6.81
2019 Equity Incentive Plan      
Stock-Based Compensation      
Shares available for future issuance | shares 1,299,218    
Common Stock Capital Shares Reserved For Future Annual Issuance | shares 432,442    
Common Stock Capital Shares Reserved For Future Issuance, Percentage Of Shares Outstanding Last Day Of Fiscal Year 4.00%    
Vesting period 4 years    
Vesting term 10 years    
2012 Stock Incentive Plan and 2019 Equity Incentive Plan      
Stock-Based Compensation      
Aggregate intrinsic value of exercisable options $ 0.4 $ 0.2  
Unrecognized compensation expense $ 5.1    
Weighted average period for recognition of unrecognized expenses 2 years 6 months