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Stockholders' Equity - Summary of Restricted Stock Activity (Detail)
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Employees [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Granted 618,174
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of restricted shares, Outstanding at beginning of period 4,706,895
Number of Shares, Granted 1,155,611
Number of restricted shares, Vested (1,038,957)
Number of restricted shares, Forfeitures (235,110)
Number of restricted shares, Conversions (1,640,198)
Number of restricted shares, Outstanding at end of period 2,948,241
Weighted average fair market value per RSU, Outstanding at beginning of period | $ / shares $ 5.20
Weighted average fair market value per RSU, Vested | $ / shares 2.35
Weighted average fair market value per RSU, Forfeitures | $ / shares 2.52
Weighted average fair market value per RSU, Conversions | $ / shares 2.68
Weighted average fair market value per RSU, Outstanding at end of period | $ / shares $ 3.02
Restricted Stock Units (RSUs) [Member] | Executive Officers [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Granted 463,129
Weighted average fair market value per RSU, Granted | $ / shares $ 2.10
Restricted Stock Units (RSUs) [Member] | Directors [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Granted 375,305
Weighted average fair market value per RSU, Granted | $ / shares $ 2.18
Restricted Stock Units (RSUs) [Member] | Employees [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Granted 317,177
Weighted average fair market value per RSU, Granted | $ / shares $ 2.10