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Stock-Based Awards - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Options, Number of Shares    
Number of Shares, beginning balance 3,102,221  
Number of Shares, Granted 734,800  
Number of Shares, Forfeited and cancelled (557,222)  
Number of Shares, ending balance 3,279,799 3,102,221
Number of Shares, Options vested and expected to vest 3,279,799  
Number of Shares, Options exercisable 1,897,671  
Options, Weighted Average Exercise Price    
Weighted Average Exercise Price, beginning balance (in dollars per share) $ 20.33  
Weighted Average Exercise Price, Granted (in dollars per share) 1.30  
Weighted Average Exercise Price, Forfeited and cancelled (in dollars per share) 21.33  
Weighted Average Exercise Price, ending balance (in dollars per share) 15.90 $ 20.33
Weighted Average Exercise Price, Options vested and expected to vest (in dollars per share) 15.90  
Weighted Average Exercise Price, Options exercisable (in dollars per share) $ 19.16  
Options, Weighted Average Remaining Contractual Term    
Weighted Average Remaining Contractual Term (in years) 6 years 11 months 26 days 6 years 6 months 18 days
Weighted Average Remaining Contractual Term, Options vested and expected to vest (in years) 6 years 11 months 26 days  
Weighted Average Remaining Contractual Term, Options exercisable (in years) 5 years 9 months 14 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value $ 316 $ 148
Aggregate Intrinsic Value, Options vested and expected to vest 316  
Aggregate Intrinsic Value, Options exercisable $ 79  
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 0.93