Annual report pursuant to Section 13 and 15(d)

Stock Plans - Schedule of Stock Option Activity (Detail)

v3.20.4
Stock Plans - Schedule of Stock Option Activity (Detail) - Stock Options [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 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 768,000
Options Exercised | shares (163,359)
Options Forfeited | shares (234,917)
Options Expired | shares (166,432)
Options, Outstanding, Ending Balance | shares 5,400,070
Options, Exercisable at December 31, 2020 | shares 4,187,251
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 13.09
Weighted-Average Exercise Price, Options Granted | $ / shares 7.01
Weighted-Average Exercise Price, Options Exercised | $ / shares 5.70
Weighted-Average Exercise Price, Options Forfeited | $ / shares 8.61
Weighted-Average Exercise Price, Options Expired | $ / shares 14.44
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares 12.60
Weighted-Average Exercise Price, Exercisable | $ / shares $ 13.91
Weighted-Average Remaining Contractual Term, Outstanding 6 years 10 months 17 days
Weighted-Average Remaining Exercisable 6 years 4 months 2 days
Weighted-Average Aggregate Intrinsic Value | $ $ 85,632
Weighted-Average Aggregate Intrinsic Value, Exercisable | $ $ 60,870