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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation        
Total grant date fair value of options vested   $ 799 $ 710  
Shares available for future issuance (in shares)   466,621   638,227
Value of share issued   $ 315 $ 13  
Weighted-average exercise price (per share)   $ 5.86   $ 7.17
Number of stock options granted (in shares)   631,055    
Options remained outstanding   2,437,124   1,931,903
Employees        
Share-based Compensation        
Weighted-average grant date fair value of options granted   $ 1.52 $ 4.00  
2016 Employee Stock Purchase Plan        
Share-based Compensation        
Increase in number of shares available for grant 180,817      
Shares available for future issuance (in shares)   576,817