COMMON STOCK (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2014	Dec. 31, 2014	Dec. 31, 2011
Common stock disclosures
Proceeds from exercise of stock options (in dollars)	$ 212	$ 456	$ 111
Proceeds from warrant exercises	12	15,952	1,129
Fair value of issuance of common stock to 401(k) plan	173	192	92
Fair value of stock issued for services	477		25
Issuance of stock for services (in dollars)	477		25
Common Stock And Warrants | Underwritten Public Offering
Common stock disclosures
Net proceeds from issuance of common stock	14,600
Issuance of equity (in shares)	14,001,250
Common Stock
Common stock disclosures
Issuance of stock upon exercise of stock options (in shares)	531,598	588,884	755,020
Proceeds from exercise of stock options (in dollars)	212	456	111
Issuance of stock upon exercise of warrants (in shares)	39,900	12,224,846	1,779,716
Warrants to purchase through cashless exercise provisions (in shares)	62,620	627,036	1,865,670
Shares issued through cashless exercise provisions	27,610
Warrants to purchase through cash exercise provisions (in shares)	12,290	11,813,334	852,946
Proceeds from warrant exercises	12	15,952	1,129
Issuance of stock to 401(k) plan (in shares)	167,011	78,884	47,105
Fair value of issuance of common stock to 401(k) plan	173
Issuance of stock for services (in shares)	298,505		15,000
Issuance of stock for services (in dollars)			25	282
Issuance of stock (in shares)	14,001,250		9,523,810
Exercise price (in dollars per share)						2.10
Common Stock | Michael J. Astrue, Then-Interim Chief Executive Officer
Common stock disclosures
Issuance of stock for services (in shares)				108,848
Common Stock | Gregory D. Perry, Then-Interim Chief Financial Officer
Common stock disclosures
Issuance of stock for services (in shares)				22,374
Common Stock | Certain Employees
Common stock disclosures
Issuance of stock for services (in shares)					167,283
Fair value of stock issued for services					195
Common Stock | Underwritten Public Offering
Common stock disclosures
Issuance of stock (in shares)	7,000,625
Equity issuance (in price per unit)	$ 1.15
Common Stock | Initial Public offering
Common stock disclosures
Issuance of stock (in shares)			9,523,810
Gross proceeds from issuance of stock (in dollars)			20,000
Net proceeds from issuance of common stock			$ 18,155
Equity issuance (in price per unit)			$ 2.10
Warrants | Underwritten Public Offering
Common stock disclosures
Equity issuance (in price per unit)	$ 0.00001
Exercise price (in dollars per share)	1.4375				1.4375
Exercise price of warrants as percentage of offering price of common stock	125.00%