FAIR VALUE MEASUREMENTS - Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets:
Cash and cash equivalents	$ 25,326	$ 67,167
Short-term investments	488	413
Total assets	25,814	67,580
Liabilities:
Contingent consideration	29,256	12,527
Total liabilities	29,256	12,527
Level 1 Inputs [Member]
Assets:
Cash and cash equivalents	25,326	67,167
Short-term investments	488	413
Total assets	25,814	67,580
Liabilities:
Contingent consideration	0	0
Total liabilities	0	0
Level 2 Inputs [Member]
Assets:
Cash and cash equivalents	0	0
Short-term investments	0	0
Total assets	0	0
Liabilities:
Contingent consideration	0	0
Total liabilities	0	0
Level 3 Inputs [Member]
Assets:
Cash and cash equivalents	0	0
Short-term investments	0	0
Total assets	0	0
Liabilities:
Contingent consideration	29,256	12,527
Total liabilities	$ 29,256	$ 12,527