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Stock Based Awards - Summary of Stock Options Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Shares Available for Grant    
Shares Available for Grant, Beginning balance   174,019
Shares Available for Grant, Additional shares authorized 269,535 261,329
Shares Available for Grant, Assumption of option plans associated with the merger 660,151  
Shares Available for Grant, Options granted   (227,450)
Shares Available for Grant, Restricted stock units granted   (428,056)
Shares Available for Grant, Options cancelled 271,895 220,158
Shares Available for Grant, Ending balance 1,201,581  
Number of shares    
Number of Shares, Beginning balance 607,511 742,052
Number of Shares, Assumption of option plans associated with the merger 1,183,950  
Number of Shares, Options granted   227,450
Number of Shares, Options exercised (3,643) (141,833)
Number of Shares, Options cancelled (271,895) (220,158)
Number of Shares, Ending balance 1,515,923 607,511
Number of Shares, Vested and expected to vest 1,514,245  
Number of Shares, Exercisable 1,469,854  
Weighted Average Exercise Price    
Weighted Average Exercise Price, Beginning balance $ 81.60 $ 66.96
Weighted Average Exercise Price, Assumption of option plans associated with the merger 0.44  
Weighted Average Exercise Price, Options granted   95.50
Weighted Average Exercise Price, Options exercised 9.66 17.62
Weighted Average Exercise Price, Options cancelled 80.09 87.90
Weighted Average Exercise Price, Ending balance 18.65 $ 81.60
Weighted Average Exercise Price, Vested and expected to vest 18.58  
Weighted Average Exercise Price, Exercisable $ 16.76  
Weighted Average Remaining Contractual Life (in years)    
Weighted Average Remaining Contractual Life (in years) 6 years 6 months  
Weighted Average Remaining Contractual Life, Vested and expected to vest 6 years 6 months  
Weighted Average Remaining Contractual Life, Exercisable 6 years 6 months  
Aggregate Intrinsic Value, Options outstanding $ 3,650  
Aggregate Intrinsic Value, Vested and expected to vest 3,650  
Aggregate Intrinsic Value, Exercisable $ 3,650