FAIR VALUE MEASUREMENTS - Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets:
Cash and cash equivalents	$ 41,985	$ 67,167
Short-term investments	479	413
Total assets	42,464	67,580
Liabilities:
Contingent consideration	28,806	12,527
Total liabilities	28,806	12,527
Level 1 Inputs [Member]
Assets:
Cash and cash equivalents	41,985	67,167
Short-term investments	479	413
Total assets	42,464	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	28,806	12,527
Total liabilities	$ 28,806	$ 12,527