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Stockholders' Equity - Summary of Restricted Stock Activity (Detail) - Restricted Stock Units (RSUs) [Member]
12 Months Ended
Dec. 31, 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 2,034,261
Number of restricted shares, Vested (1,863,731)
Number of restricted shares, Forfeitures (591,398)
Number of restricted shares, Conversions (2,119,925)
Number of restricted shares, Outstanding at end of period 2,166,102
Weighted average fair market value per RSU, Outstanding at beginning of period | $ / shares $ 5.20
Weighted average fair market value per RSU, Vested | $ / shares 2.57
Weighted average fair market value per RSU, Forfeitures | $ / shares 2.46
Weighted average fair market value per RSU, Conversions | $ / shares 2.72
Weighted average fair market value per RSU, Outstanding at end of period | $ / shares $ 2.59
Executive Officers [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Granted 1,183,750
Weighted average fair market value per RSU, Granted | $ / shares $ 2.25
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 381,250
Weighted average fair market value per RSU, Granted | $ / shares $ 2.28