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Stock-Based Compensation - Summary of Restricted Stock Activity (Detail) - Restricted Stock - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Number of Shares    
Unvested, beginning balance (in shares) 1,886 2,618
Granted (in shares) 2,013 0
Vested (in shares) (548) (675)
Forfeited (in shares) (200) (57)
Unvested, ending balance (in shares) 3,151 1,886
Weighted Average    
Unvested, beginning balance (in dollars per share) $ 5.14 $ 6.91
Granted (in dollars per share) 2.88 0
Vested (in dollars per share) (7.11) (9.46)
Forfeited (in dollars per share) 5.71 13.16
Unvested, ending balance (in dollars per share) $ 3.06 $ 5.14