Quarterly report pursuant to Section 13 or 15(d)

Stock Plans - Schedule of Stock Option Activity (Detail)

v3.19.2
Stock Plans - Schedule of Stock Option Activity (Detail) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options, Outstanding, Beginning Balance 5,154,691
Options Granted 555,346
Options Exercised (47,099)
Options Forfeited (183,892)
Options Expired (58,459)
Options, Outstanding, Ending Balance 5,420,587
Options Exercisable at June 30, 2019 3,269,820
Weighted-Average Exercise Price, Outstanding, Beginning Balance $ 13.78
Weighted-Average Exercise Price, Options Granted 5.98
Weighted-Average Exercise Price, Options Exercised 2.56
Weighted-Average Exercise Price, Options Forfeited 12.45
Weighted-Average Exercise Price, Options Expired 13.09
Weighted-Average Exercise Price, Outstanding, Ending Balance 13.13
Weighted-Average Exercise Price, Exercisable $ 13.94
Weighted-Average Remaining Contractual Term, Outstanding 8 years 29 days
Weighted-Average Remaining Exercisable 7 years 7 months 24 days
Weighted-Average Aggregate Intrinsic Value $ 3,368
Weighted-Average Aggregate Intrinsic Value, Exercisable $ 1,811