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Stock-Based Compensation - Summary of Options and Awards Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Stock-based compensation    
Options and Awards Available for Grant, Outstanding, Beginning balance 638,227  
Options and Awards Available for Grant, Options authorized 542,452  
Options and Awards Available for Grant, RSUs granted (405,054)  
Options Available for Grant, RSUs cancelled/forfeited 24,697  
Options and Awards Available for Grant, Options granted (787,955)  
Options and Awards Available for Grant, Options cancelled/forfeited 143,817  
Options and Awards Available for Grant, Outstanding, Ending balance 156,184 638,227
Number of Options, Outstanding, Beginning balance 1,931,903  
Number of Options, Options granted 787,955  
Number of Options, Options exercised (144,774)  
Number of Options, Options cancelled/forfeited (158,455)  
Number of Options, Outstanding, Ending balance 2,416,629 1,931,903
Number of Options, exercisable 1,047,031  
Weighted - Average Exercise Price Per Share, Options outstanding, Beginning balance $ 7.17  
Weighted - Average Exercise Price Per Share, Options granted 2.39  
Weighted - Average Exercise Price Per Share, Options exercised 5.36  
Weighted - Average Exercise Price Per Share, Options cancelled/forfeited 8.30  
Weighted - Average Exercise Price Per Share, Options outstanding, Ending balance 5.65 $ 7.17
Weighted - Average Exercise Price Per Share, Options exercisable $ 7.29  
Weighted - Average Remaining Contractual Life, Options outstanding 8 years 6 years 6 months
Weighted - Average Remaining Contractual Life, Options exercisable 6 years 4 months 24 days  
Aggregate Intrinsic Value, Options outstanding $ 4,347 $ 188
Aggregate Intrinsic Value, Options exercised 170  
Aggregate Intrinsic Value, Options exercisable $ 463