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Stock-Based Compensation - Summary of Restricted Stock Activity (Detail) - Restricted Stock
shares in Thousands
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Number of Shares  
Unvested, Beginning balance (in shares) | shares 2,618
Granted (in shares) | shares 0
Vested (in shares) | shares (140)
Forfeited (in shares) | shares (26)
Unvested, Ending balance (in shares) | shares 2,452
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 14.80
Forfeited (in dollars per share) | $ / shares 15.86
Unvested, Ending balance (in dollars per share) | $ / shares $ 4.97