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Summary Restricted Stock Awards and Restricted Stock Units Activity (Detail) - Restricted Stock
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested Shares, Beginning Balance | shares 1,632,000
Granted, Shares | shares 615,000
Vested, Shares | shares (476,000)
Forfeited, Shares | shares (253,000)
Unvested Shares, Ending Balance | shares 1,518,000
Weighted average grant date fair value, Beginning Balance | $ / shares $ 3.18
Granted, Weighted average grant date fair value | $ / shares 2.54
Vested, Weighted average grant date fair value | $ / shares 3.77
Forfeited, Weighted average grant date fair value | $ / shares 2.80
Weighted average grant date fair value, Ending Balance | $ / shares $ 2.80