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STOCK-BASED COMPENSATION - ADDITIONAL INFORMATION (Detail) - USD ($) | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of options for every share issued (in shares) | 1.75 |
Percentage of fair market value on the purchase date | 85.00% |
Maximum number of shares per employee (in shares) | 2,000 |
Employee stock purchase plan offering period | 6 months |
Maximum value of shares per employee | $ 25,000 |
Common stock reserved for issuance (in shares) | 1,000,000 |
Shares purchased by employee since inception of ESPP (in shares) | 621,269 |
Shares purchased under ESPP (in shares) | 17,711 | 23,713
Unrecognized compensation cost | $ 8,300,000 |
Outstanding stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based payment award vesting period (years) | 4 years |
Outstanding stock options | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based payment award expiration period (years) | 7 years |
Outstanding stock options | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based payment award expiration period (years) | 10 years |
Unvested restricted stock awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based payment award vesting period (years) | 1 year |
Unrecognized compensation cost, recognized over an estimated weighted-average period (years) | 11 months 4 days |
Unvested RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based payment award vesting period (years) | 3 years |
Unrecognized compensation cost, recognized over an estimated weighted-average period (years) | 2 years 1 month 9 days |
Standard Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost, recognized over an estimated weighted-average period (years) | 2 years 7 months 13 days |
Market Condition Based Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost, recognized over an estimated weighted-average period (years) | 2 years 9 months 3 days |

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