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Stockholders' Equity - Summary of Restricted Stock Activity (Detail) - Restricted Stock Units (RSUs) [Member]
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Restricted Shares, Outstanding at beginning of period 4,298,154
Number of Shares, Granted 1,703,616
Number of Restricted Shares, Vested (592,066)
Number of Restricted Shares, Forfeitures (92,000)
Number of Restricted Shares, Conversions (733,407)
Number of Restricted Shares, Outstanding at end of period 4,584,797
Weighted Average Fair Market Value Per RSU, Outstanding at beginning of period | $ / shares $ 10.23
Weighted Average Fair Market Value Per RSU, Vested | $ / shares 2.68
Weighted Average Fair Market Value Per RSU, Forfeitures | $ / shares 4.14
Weighted Average Fair Market Value Per RSU, Conversions | $ / shares 10.44
Weighted Average Fair Market Value Per RSU, Outstanding at end of period | $ / shares $ 7.29
Executive Officer [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Granted 805,616
Weighted Average Fair Market Value Per RSU, Granted | $ / shares $ 3.80
Directors [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Granted 185,000
Weighted Average Fair Market Value Per RSU, Granted | $ / shares $ 2.43
Employees [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Granted 713,000
Weighted Average Fair Market Value Per RSU, Granted | $ / shares $ 3.64