BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Details 5) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	May 31, 2014	Dec. 31, 2013
Number of authorized shares of common stock
Common stock, authorized shares	300,000,000		300,000,000		300,000,000	150,000,000.0	150,000,000
Reclassifications from accumulated other comprehensive income
Reclassifications out of accumulated other comprehensive income	$ 0	$ 0	$ 0	$ 0
Options to purchase shares of common stock and RSUs
Potential common shares excluded from the calculation of diluted net income (loss) per common share
Antidilutive securities related to potential shares excluded from calculation of net income (loss) per share (in shares)	904,954	8,739,777	750,827	8,739,777
Warrants
Potential common shares excluded from the calculation of diluted net income (loss) per common share
Antidilutive securities related to potential shares excluded from calculation of net income (loss) per share (in shares)	9,705,442	9,705,442	9,705,442	9,705,442
2020 Notes convertible into shares of common stock
Potential common shares excluded from the calculation of diluted net income (loss) per common share
Antidilutive securities related to potential shares excluded from calculation of net income (loss) per share (in shares)	5,459,311	5,459,311	5,459,311	5,459,311
2018 Notes convertible into shares of common stock
Potential common shares excluded from the calculation of diluted net income (loss) per common share
Antidilutive securities related to potential shares excluded from calculation of net income (loss) per share (in shares)	4,246,131	4,246,131	4,246,131	4,246,131
2017 Notes convertible into shares of common stock
Potential common shares excluded from the calculation of diluted net income (loss) per common share
Antidilutive securities related to potential shares excluded from calculation of net income (loss) per share (in shares)	0	7,842,943	0	7,842,943