INCOME TAXES - Effective Tax Rate Reconciliation (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Federal statutory income tax rate (in hundredths)	35.00%
Income tax reconciliation [Abstract]
Tax at federal statutory rate	$ (5,308,000)	$ (16,292,000)	$ (9,364,000)
State taxes, net	(1,289,000)	(1,136,000)	(1,740,000)
Non-deductible stock compensation	327,000	3,470,000	453,000
Non-deductible acquisition costs	0	410,000	878,000
Foreign rate differential	3,245,000	4,353,000	1,274,000
Research credits	(930,000)	0	(692,000)
Change in valuation allowance	4,961,000	(26,795,000)	10,461,000
Other	155,000	137,000	135,000
Income tax provision (benefit)	1,161,000	(35,853,000)	1,405,000
Change in valuation amount	$ 300,000	$ 37,100,000	$ 0