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Stock-Based Compensation - Summary of Restricted Stock Awards Activity (Detail) - Restricted Stock [Member]
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Non-vested restricted stock, beginning balance | shares 1,088,168
Shares, granted | shares 1,364,000
Shares, vested | shares (214,142)
Shares, forfeited | shares (81,654)
Shares, Non-vested restricted stock, ending balance | shares 2,156,372
Weighted Average Grant Date Fair Value Per Share, Non-vested restricted stock, beginning balance | $ / shares $ 5.96
Weighted Average Grant Date Fair Value Per Share, granted | $ / shares 2.29
Weighted Average Grant Date Fair Value Per Share, vested | $ / shares 5.88
Weighted Average Grant Date Fair Value Per Share, forfeited | $ / shares 4.27
Weighted Average Grant Date Fair Value Per Share, Non-vested restricted stock, ending balance | $ / shares $ 3.71