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STOCK BASED COMPENSATION - Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Number of Units  
Outstanding as of January 1, 2017 | shares 114,838
Granted | shares 209,268
Vested and released | shares (37,185)
Forfeited | shares (11,817)
Outstanding as of September 30, 2017 | shares 275,104
Weighted Average Grant Date Fair Value Per Share  
Outstanding as of January 1, 2017 | $ / shares $ 104.22
Granted | $ / shares 83.05
Vested and released | $ / shares 93.87
Forfeited | $ / shares 93.91
Outstanding as of September 30, 2017 | $ / shares $ 89.95
Weighted Average Remaining Contractual Life  
Outstanding as of September 30, 2017 2 years 2 months 1 day
Total Aggregate Intrinsic Value  
Outstanding as of September 30, 2017 | $ $ 19,703