Quarterly report pursuant to Section 13 or 15(d)

Stock Plans - Schedule of Stock Option Activity (Detail)

v3.20.1
Stock Plans - Schedule of Stock Option Activity (Detail) - Stock Options [Member]
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 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 487,500
Options Forfeited | shares (86,287)
Options Expired | shares (85,979)
Options, Outstanding, Ending Balance | shares 5,512,012
Options Exercisable at March 31, 2020 | shares 4,016,843
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 13.09
Weighted-Average Exercise Price, Options Granted | $ / shares 2.69
Weighted-Average Exercise Price, Options Forfeited | $ / shares 10.09
Weighted-Average Exercise Price, Options Expired | $ / shares 14.26
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares 12.20
Weighted-Average Exercise Price, Exercisable | $ / shares $ 13.82
Weighted-Average Remaining Contractual Term, Outstanding 7 years 6 months
Weighted-Average Remaining Exercisable 7 years
Weighted-Average Aggregate Intrinsic Value | $ $ 212
Weighted-Average Aggregate Intrinsic Value, Exercisable | $ $ 212