v3.3.1.900

SHARE-BASED COMPENSATION - RSU Activity - Summary of Change (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Number of Restricted Stock Units [Roll Forward] |  |  |
RSUs beginning | 1,258,685 |  |
RSUs awarded | 795,693 | 685,000 | 361,000
RSUs released | (406,463) | (410,000) | (547,000)
RSUs forfeited | (57,498) |  |
RSUs ending | 1,590,417 | 1,258,685 |
Weighted Average Purchase Price RSUs | $ 0 |  |
Weighted Average Remaining Contractual Term (Years) RSUs | 1 year 1 month 6 days |  |
Aggregate Intrinsic Value RSUs | $ 18,051,233 |  |
Number of RSUs vested and expected to vest | 1,512,428 |  |
Weighted Average Purchase Price of RSUs vested and expected to vest | $ 0 |  |
Weighted Average Remaining Contractual Term (Years) of RUSs vested and expected to vest | 1 year |  |
Aggregate Intrinsic Value RSUs vested and expected to vest | $ 16,242,396 |  |
Number of RSUs exercisable | 81,380 |  |
Weighted Average Purchase Price of RUSs exercisable | $ 0 |  |
Weighted Average Remaining Contractual Term (Years) of RUSs exercisable | 0 years |  |
Aggregate Intrinsic Value RSUs exercisable | $ 923,663 |  |
Weighted average remaining recognition period in years | 1 year 9 months 18 days |  |
Unamortized compensation expense, net of estimated forfeitures | $ 7,988,821 |  |

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