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STOCKHOLDERS' EQUITY - Summary of Restricted Stock, Restricted Stock Unit and Performance-based Stock Unit Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Weighted Average Exercise Price  
Outstanding at beginning of period (in USD per share) | $ / shares $ 4.49
Granted (in USD per share) | $ / shares 6.32
Forfeited (in USD per share) | $ / shares 5.52
Outstanding at end of period (in USD per share) | $ / shares 5.29
Expected to vest at end of period (in USD per share) | $ / shares $ 5.24
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
Weighted Average Remaining Contractual Term, Outstanding 1 year 9 months
Weighted Average Remaining Contractual Term, Expected to vest 1 year 8 months 15 days
Aggregate Intrinsic Value, Outstanding at end of period | $ $ 4,768
Aggregate Intrinsic Value, Expected to vest at end of period | $ $ 4,106
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units  
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units  
Outstanding at beginning of period | shares 962
Granted (in shares) | shares 400
Forfeited (in shares) | shares (7)
Outstanding at end of period | shares 951
Expected to vest at end of period (in shares) | shares 811
Class A Common Stock  
Weighted Average Exercise Price  
Class A Common Stock Vested (in USD per share) | $ / shares $ 4.40
Class A Common Stock | Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units  
Restricted Stock, Restricted Stock Units, and Performance-Based Stock Units  
Class A Common Stock Vested (in shares) | shares (404)