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Stock Based Awards - Summary of Stock Options Activity (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Number of Shares  
Number of Shares, Beginning balance | shares 1,515,923
Number of Shares, Options granted | shares 396,128
Number of Shares, Options cancelled | shares (60,917)
Number of Shares, Ending balance | shares 1,851,134
Number of Shares, Outstanding and expected to vest | shares 1,816,265
Number of Shares, Exercisable | shares 1,449,684
Weighted Average Exercise Price  
Weighted Average Exercise Price, Beginning balance | $ / shares $ 18.65
Weighted Average Exercise Price, Options granted | $ / shares 5.52
Weighted Average Exercise Price, Options cancelled | $ / shares 89.77
Weighted Average Exercise Price, Ending balance | $ / shares 13.50
Weighted Average Exercise Price, Outstanding and expected to vest | $ / shares 13.60
Weighted Average Exercise Price, Exercisable | $ / shares $ 14.06
Weighted Average Remaining Contractual Life (in years)  
Weighted Average Remaining Contractual Life (in years) 7 years 2 months 12 days
Weighted Average Remaining Contractual Life, Outstanding and expected to vest 7 years 2 months 12 days
Weighted Average Remaining Contractual Life, Exercisable 6 years 7 months 6 days
Aggregate Intrinsic Value, Options outstanding | $ $ 8,424
Aggregate Intrinsic Value, Outstanding and expected to vest | $ 8,380
Aggregate Intrinsic Value, Exercisable | $ $ 7,897