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STOCK BASED COMPENSATION - Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Number of Units  
Outstanding as of January 1, 2017 | shares 114,838
Granted | shares 183,940
Vested and released | shares (30,000)
Forfeited | shares (1,627)
Outstanding as of March 31, 2017 | shares 267,151
Weighted Average Grant Date Fair Value Per Share  
Outstanding as of January 1, 2017 | $ / shares $ 104.22
Granted | $ / shares 83.24
Vested and released | $ / shares 76.87
Forfeited | $ / shares 110.46
Outstanding as of March 31, 2017 | $ / shares $ 92.68
Weighted Average Remaining Contractual Life  
Outstanding as of March 31, 2017 2 years 6 months 22 days
Total Aggregate Intrinsic Value  
Outstanding as of March 31, 2017 | $ $ 24,760