Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Stock Option Activity Under Equity Incentive Plan (Detail)

v3.8.0.1
Stock Based Compensation - Stock Option Activity Under Equity Incentive Plan (Detail) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Aug. 01, 2017
Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Number of Shares, Outstanding, Beginning Balance   941,682
Number of Shares, Options assumed in merger 963,681 963,681
Number of Shares, Granted   306,627
Number of Shares, Exercised   (3,335)
Number of Shares, Forfeitures   (3,094)
Number of Shares, Outstanding, Ending Balance   2,205,561
Number of Shares, Vested and expected to vest   2,194,308
Number of Shares, Exercisable   1,870,232
Weighted-Average Exercise Price, Outstanding, Beginning Balance   $ 0.92
Weighted-Average Exercise Price, Options assumed in merger   33.62
Weighted-Average Exercise Price, Granted   6.40
Weighted-Average Exercise Price, Exercised   4.23
Weighted-Average Exercise Price, Forfeitures   1.84
Weighted-Average Exercise Price, Outstanding, Ending Balance   15.96
Weighted-Average Exercise Price, Vested and expected to vest   16.01
Weighted-Average Exercise Price, Exercisable   $ 17.75
Weighted-Average Remaining Contractual Term, Outstanding   4 years 1 month 10 days
Weighted-Average Remaining Contractual Term, Vested and expected to vest   4 years 29 days
Weighted-Average Remaining Contractual Term, Exercisable   3 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding   $ 6,140
Aggregate Intrinsic Value, Vested and expected to vest   6,131
Aggregate Intrinsic Value, Exercisable   $ 5,773