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Stock-Based Compensation - Schedule of Non-vested Units (Detail) - Non-vested Units
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Units  
Outstanding beginning balance (in shares) | shares 4,738,333
Granted (in shares) | shares 0
Vested (in shares) | shares (325,835)
Forfeited (in shares) | shares (54,800)
Outstanding ending balance (in shares) | shares 4,357,698
Avg Fair Value at Grant Date  
Outstanding beginning balance (in dollars per share) | $ / shares $ 0.12
Granted (in dollars per share) | $ / shares 0
Vested (in dollars per share) | $ / shares 0.15
Forfeited (in dollars per share) | $ / shares 0.08
Outstanding ending balance (in dollars per share) | $ / shares $ 0.12