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Stockholders' Equity - Summary of Restricted Stock Activity (Detail) - Restricted Stock Units (RSUs) [Member]
9 Months Ended
Sep. 30, 2018
$ / shares
shares
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 1,824,872
Number of restricted shares, Vested (1,733,731)
Number of restricted shares, Forfeitures (442,009)
Number of restricted shares, Conversions (2,119,925)
Number of restricted shares, Outstanding at end of period 2,236,102
Weighted average fair market value per RSU, Outstanding at beginning of period | $ / shares $ 5.20
Weighted average fair market value per RSU, Vested | $ / shares 2.50
Weighted average fair market value per RSU, Forfeitures | $ / shares 2.63
Weighted average fair market value per RSU, Conversions | $ / shares 2.72
Weighted average fair market value per RSU, Outstanding at end of period | $ / shares $ 5.15
Executive Officers [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Granted 1,038,434
Weighted average fair market value per RSU, Granted | $ / shares $ 2.23
Directors [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Granted 469,261
Weighted average fair market value per RSU, Granted | $ / shares $ 2.59
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