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Share-Based Payment Awards - Stock Option Activity Under Company's Equity Incentive Plan (Detail) - Equity Incentive Plans and Inducement Awards [Member]
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options Outstanding, Beginning balance | shares 1,338,880
Number of Options, Granted | shares 833,727
Number of Options, Exercised | shares (827)
Number of Options, Forfeited | shares (48,304)
Number of Options, Expired | shares (23,666)
Number of Options Outstanding, Ending balance | shares 2,099,810
Number of Options, Exercisable at June 30, 2021 | shares 834,187
Weighted Average Exercise Price Outstanding, Beginning balance | $ / shares $ 20.86
Weighted Average Exercise Price, Granted | $ / shares 12.98
Weighted Average Exercise Price, Exercised | $ / shares 11.65
Weighted Average Exercise Price, Forfeited | $ / shares 17.31
Weighted Average Exercise Price, Expired | $ / shares 31.92
Weighted Average Exercise Price Outstanding, Ending balance | $ / shares 17.69
Weighted Average Exercise Price, Exercisable at June 30, 2021 | $ / shares $ 23.42
Weighted Average Remaining Contractual Life, Outstanding at June 30, 2021 8 years 18 days
Weighted Average Remaining Contractual Life, Exercisable at June 30, 2021 6 years 4 months 6 days
Aggregate Intrinsic Value, Outstanding at June 30, 2021 | $ $ 134
Aggregate Intrinsic Value, Exercisable at June 30, 2021 | $ $ 3