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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Significant Noncash Transactions (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Significant Noncash Transactions [Line Items]      
Unrealized (loss) gain on available-for-sale securities $ (10,000) $ (31,000) $ (1,000)
Cash paid for income taxes 6,600,000 5,300,000 2,000,000
Common stock issued to Board of Directors and Scientific Advisory Board that was earned in a previous period [Member]
     
Other Significant Noncash Transactions [Line Items]      
Other non-cash activities 315,000 328,000 300,000
Common stock issued to employees that was accrued for in a previous period, net of shares withheld for taxes [Member]
     
Other Significant Noncash Transactions [Line Items]      
Other non-cash activities 282,000 252,000 1,113,000
Fair value of stock warrant liability reclassified to shareholders’ equity upon exercise [Member]
     
Other Significant Noncash Transactions [Line Items]      
Other non-cash activities $ 0 $ 0 $ 14,850,000