Quarterly report pursuant to Section 13 or 15(d)

Stock Plans - Schedule of Stock Option Activity (Detail)

v3.20.2
Stock Plans - Schedule of Stock Option Activity (Detail) - Stock Options [Member]
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options, Outstanding, Beginning Balance | shares 5,196,778
Options Granted | shares 551,500
Options Exercised | shares (25,242)
Options Forfeited | shares (133,839)
Options Expired | shares (142,330)
Options, Outstanding, Ending Balance | shares 5,446,867
Options Exercisable at March 31, 2020 | shares 4,160,659
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 13.09
Weighted-Average Exercise Price, Options Granted | $ / shares 3.34
Weighted-Average Exercise Price, Options Exercised | $ / shares 2.72
Weighted-Average Exercise Price, Options Forfeited | $ / shares 9.04
Weighted-Average Exercise Price, Options Expired | $ / shares 14.10
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares 12.22
Weighted-Average Exercise Price, Exercisable | $ / shares $ 13.83
Weighted-Average Remaining Contractual Term, Outstanding 7 years 3 months 18 days
Weighted-Average Remaining Exercisable 6 years 10 months 24 days
Weighted-Average Aggregate Intrinsic Value | $ $ 15,731
Weighted-Average Aggregate Intrinsic Value, Exercisable | $ $ 5,328