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Stock-Based Compensation - Summary of Outstanding Stock Options and Related Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Outstanding Shares, beginning balance | shares 205
Granted Shares | shares 20
Exercised Shares | shares (21)
Forfeited Shares | shares (8)
Expired Shares | shares (2)
Outstanding Shares, ending balance | shares 194
Vested and expected to vest Shares | shares 181
Exercisable Shares | shares 140
Outstanding Weighted Avg. Exercise Price, beginning balance | $ / shares $ 3.95
Granted, Weighted Avg. Exercise Price | $ / shares 5.94
Exercised, Weighted Avg. Exercise Price | $ / shares 3.12
Forfeited, Weighted Avg. Exercise Price | $ / shares 2.99
Expired, Weighted Avg. Exercise Price | $ / shares 16.28
Outstanding Weighted Avg. Exercise Price, ending balance | $ / shares 3.95
Vested and expected to vest, Weighted Avg. Exercise Price | $ / shares 4.03
Exercisable, Weighted Avg. Exercise Price | $ / shares $ 4.04
Outstanding Wtd. Avg. Remaining Contractual Life 4 years 10 months 24 days
Vested and expected to vest, Wtd. Avg. Remaining Contractual Life 4 years 10 months 24 days
Exercisable, Wtd. Avg. Remaining Contractual Life 3 years 7 months 6 days
Aggregate Intrinsic Value, Exercised | $ $ 55
Aggregate Intrinsic Value, Forfeited | $ 20
Aggregate Intrinsic Value, ending balance | $ 218
Vested and expected to vest, Aggregate Intrinsic Value | $ 211
Exercisable, Aggregate Intrinsic Value | $ $ 163