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STOCK BASED COMPENSATION - Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Number of Units  
Outstanding as of January 1, 2017 | shares 114,838
Granted | shares 202,711
Vested and released | shares (34,079)
Forfeited | shares (9,169)
Outstanding as of June 30, 2017 | shares 274,301
Weighted Average Grant Date Fair Value Per Share  
Outstanding as of January 1, 2017 | $ / shares $ 104.22
Granted | $ / shares 83.30
Vested and released | $ / shares 93.86
Forfeited | $ / shares 95.52
Outstanding as of June 30, 2017 | $ / shares $ 90.33
Weighted Average Remaining Contractual Life  
Outstanding as of June 30, 2017 2 years 4 months 17 days
Total Aggregate Intrinsic Value  
Outstanding as of June 30, 2017 | $ $ 20,936