Quarterly report pursuant to Section 13 or 15(d)

Stock Option and Incentive Plans - Summary of Stock Option Activity (Detail)

v3.21.2
Stock Option and Incentive Plans - Summary of Stock Option Activity (Detail)
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of Options, Options outstanding, Beginning balance | shares 1,853,841
Number of Options, Granted | shares 1,227,500
Number of Options, Exercised | shares 0
Number of Options, Expired | shares (95,978)
Number of Options, Forfeited | shares (34,812)
Number of Options, Options outstanding, Ending balance | shares 2,950,551
Number of Options, Vested and exercisable, Ending Balance | shares 1,324,857
Weighted Average Exercise Price, Options outstanding, Beginning balance | $ / shares $ 14.33
Weighted Average Exercise Price, Granted | $ / shares 4.31
Weighted Average Exercise Price, Exercised | $ / shares
Weighted Average Exercise Price, Expired | $ / shares 46.18
Weighted Average Exercise Price, Forfeited | $ / shares 5.62
Weighted Average Exercise Price, Options outstanding, Ending balance | $ / shares 9.22
Weighted Average Exercise Price, Vested and exercisable, Ending balance | $ / shares $ 13.74
Weighted Average Remaining Contractual Life (in years), Options outstanding 8 years 1 month 6 days
Weighted Average Remaining Contractual Life (in years), Vested and exercisable 6 years 10 months 9 days
Aggregate Intrinsic value, Options outstanding | $ $ 72,725
Aggregate Intrinsic value, Vested and exercisable | $ $ 16,125