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Stock-Based Compensation - Schedule of Nonvested Restricted Stock Units Activity (Detail) - Restricted Stock Units [Member]
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Share-Based Compensation  
Number of Shares, Nonvested restricted shares at the beginning of the period | shares 606,497
Number of Shares, Restricted shares granted | shares 1,217,189
Number of Shares, Restricted shares vested | shares (64,772)
Number of Shares, Restricted shares forfeited | shares (44,451)
Number of Shares, Cancelled | shares 0
Number of Shares, Nonvested restricted shares at the end of the period | shares 1,714,463
Weighted-Average Grant Date Fair Value, Nonvested restricted shares at the beginning of the period | $ / shares $ 5.23
Weighted-Average Grant Date Fair Value, Granted | $ / shares 5.06
Weighted-Average Grant Date Fair Value, Vested | $ / shares 5.82
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares 5.72
Weighted-Average Grant Date Fair Value, Cancelled | $ / shares 0
Weighted-Average Grant Date Fair Value, Nonvested restricted shares at the end of the period | $ / shares $ 5.08