FAIR VALUE MEASUREMENTS (Details 2) (Warrant liability, USD $)	9 Months Ended
	Sep. 30, 2013
Warrant liability
Liabilities:
Balance at the beginning of the period	$ 3,100,000
Balance at the end of the period	$ 3,100,000
Number of warrants expired (in shares)	337,918
Number of warrants outstanding (in shares)	931,099
Weighted-average exercise price of warrant outstanding (in dollars per share)	$ 7.59