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Stock-Based Compensation - Summary of Restricted Stock Activity (Detail) - Restricted Stock
shares in Thousands
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Number of Shares  
Unvested, Beginning balance (in shares) | shares 2,618
Granted (in shares) | shares 0
Vested (in shares) | shares (324)
Forfeited (in shares) | shares (57)
Unvested, Ending balance (in shares) | shares 2,237
Weighted Average  
Unvested, Beginning balance (in dollars per share) | $ / shares $ 6.91
Granted (in dollars per share) | $ / shares 0
Vested (in dollars per share) | $ / shares 11.77
Forfeited (in dollars per share) | $ / shares 13.16
Unvested, Ending balance (in dollars per share) | $ / shares $ 4.85