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Stock-Based Compensation - Summary of Restricted Performance Stock Unit and Equity Incentive Activity (Detail)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Number of Options Outstanding  
Number of Options Outstanding, Beginning balance (in shares) | shares 59,000
Number of Options Outstanding, Ending balance (in shares) | shares 59,000
Options vested or expected to vest, Outstanding (in shares) | shares 59,000
Weighted Average Exercise Price  
Weighted Average Exercise Price, Beginning balance (in dollars per share) | $ / shares $ 18.33
Weighted Average Exercise Price, Ending balance (in dollars per share) | $ / shares 18.33
Vested or expected to vest (in dollar per share) | $ / shares $ 18.33
Restricted Stock Units [Member]  
Number of Awards  
Number of Awards, Beginning balance (in shares) | shares 183,726
Granted (in shares) | shares 905,089
Settled (in shares) | shares (83,937)
Forfeited or expired (in shares) | shares (18,975)
Number of Awards, Ending balance (in shares) | shares 985,903
Number of Awards, vested or expected to vest, Outstanding (in shares) | shares 843,451
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share) | $ / shares $ 17.26
Granted (in dollars per share) | $ / shares 5.29
Settled (in dollars per share) | $ / shares 16.52
Forfeited or expired (in dollars per share) | $ / shares 15.79
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares 6.36
Vested or expected to vest (in dollar per share) | $ / shares $ 6.45
Performance Shares Unit [Member]  
Number of Awards  
Number of Awards, Beginning balance (in shares) | shares 296,523
Granted (in shares) | shares 1,475,277
Settled (in shares) | shares (31,081)
Forfeited or expired (in shares) | shares (53,396)
Number of Awards, Ending balance (in shares) | shares 1,687,323
Number of Awards, vested or expected to vest, Outstanding (in shares) | shares 1,349,429
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share) | $ / shares $ 19.1
Granted (in dollars per share) | $ / shares 6.09
Settled (in dollars per share) | $ / shares 22.81
Forfeited or expired (in dollars per share) | $ / shares 18.02
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares 7.68
Vested or expected to vest (in dollar per share) | $ / shares $ 6.77