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Stock-Based Compensation - Narratives (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
item
$ / shares
shares
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Stock-Based Compensation      
Number of equity incentive plans | item 2    
2012 Stock Incentive Plan      
Stock-Based Compensation      
Weighted average grant date fair value (per share) | $ / shares $ 8.13 $ 6.81 $ 1.08
Aggregate intrinsic value $ 200,000    
Unrecognized compensation expense $ 4,900,000    
Weighted average period for recognition of unrecognized expenses 2 years 7 months 6 days    
2012 Stock Incentive Plan | Current Liability      
Stock-Based Compensation      
Proceeds from early exercise of option $ 1,000    
2019 Equity Incentive Plan      
Stock-Based Compensation      
Shares available for future issuance | shares 1,199,997    
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