FAIR VALUE MEASUREMENTS - SCHEDULE OF SHORT-TERM INVESTMENTS (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Short-term Investments, Amortized Cost	$ 39,910	$ 39,933
Short-term Investments, Gross Unrealized Holding Gains	17	0
Short-term Investments, Gross Unrealized Holding Losses	0	(15)
Short-term Investments, Fair Value	39,927	39,918
U.S. Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Short-term Investments, Amortized Cost	39,910	39,933
Short-term Investments, Gross Unrealized Holding Gains	17	0
Short-term Investments, Gross Unrealized Holding Losses	0	(15)
Short-term Investments, Fair Value	$ 39,927	$ 39,918