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Stockholders' Equity - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of Restricted Stock Units, Beginning Balance 839,075 546,500
Number of Restricted Stock Units, Granted 731,225 607,150
Number of Restricted Stock Units, Released (435,450) (266,500)
Number of Restricted Stock Units, Forfeited (18,208) (48,075)
Number of Restricted Stock Units, Ending Balance 1,116,642 839,075
Weighted Average Award Date Fair Value per Share, Beginning Balance $ 7.49 $ 8.53
Weighted Average Award Date Fair Value per Share, Granted 14.40 7.14
Weighted Average Award Date Fair Value per Share, Released 7.72 8.84
Weighted Average Award Date Fair Value per Share, Forfeited 10.37 7.34
Weighted Average Award Date Fair Value per Share, Ending Balance $ 11.88 $ 7.49