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Stock-based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Jan. 01, 2020
Jan. 01, 2019
Jan. 01, 2018
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jan. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock eligible to be purchased (in shares)       8,723,000   7,483,000 1,753,758
Weighted average fair value of options granted (in dollars per share)       $ 4.23 $ 2.77    
Intrinsic value of stock options exercised       $ 0.1 $ 0.1    
Unrecognized stock-based compensation expense, options       $ 14.8      
Future Issuances from Employee Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock reserved for issuance (in shares)       1,320,488      
Shares of common stock eligible to be purchased (in shares)       1,320,000   1,288,000  
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock eligible to be purchased (in shares)       760,000   460,000  
Aggregate fair value of awards vested in period       $ 0.8      
Vested (in shares)       101,000 0    
Unrecognized stock-based compensation expense, RSUs       $ 3.7      
Remaining weighted average vesting period       2 years 11 days      
Employee Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Remaining weighted average vesting period       2 years 6 months 26 days      
2013 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock reserved for issuance (in shares)             0
Shares of common stock eligible to be purchased (in shares)             243,758
2017 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock eligible to be purchased (in shares)             1,510,000
Percent of outstanding shares able to be added each year             4.00%
Number of additional shares authorized (in shares) 1,349,526 1,317,935 1,290,609        
2017 Employee Stock Purchase Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock eligible to be purchased (in shares)             302,000
Percent of outstanding shares able to be added each year             1.00%
Number of additional shares authorized (in shares) 337,381 329,483 322,652        
Shares of common stock to determine number of additional shares (in shares)             603,000