Consolidated Statements of Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2011	$ 7,059	$ 31	$ 58,901	$ (51,873)	$ 0
Balance (in shares) at Dec. 31, 2011		31,292,520
Stock-based compensation	1,852	0	1,852	0	0
Issuance of common stock for exclusive channel collaboration agreement	7,814	3	7,811	0	0
Issuance of common stock for exclusive channel collaboration agreement (in shares)		3,552,210
Issuance of common stock for acquisition of program assets	1,169	1	1,168	0	0
Issuance of common stock for acquisition of program assets (in shares)		625,000
Issuance of common stock for stock options and warrants exercised	2,082	2	2,080	0	0
Issuance of common stock for stock options and warrants exercised (in shares)		2,143,018
Issuance of common stock, net of issuance costs	10,120	7	10,113	0	0
Issuance of common stock, net of issuance costs (in shares)		6,750,000
Net loss	(17,068)	0	0	(17,068)	0
Balance at Dec. 31, 2012	13,028	44	81,925	(68,941)	0
Balance (in shares) at Dec. 31, 2012		44,362,748
Stock-based compensation	1,669	0	1,669	0	0
Issuance of common stock, net of issuance costs	12,193	13	12,180	0	0
Issuance of common stock, net of issuance costs (in shares)		13,225,000
Issuance of common stock for exercise of stock options	232	1	231	0	0
Issuance of common stock for exercise of stock options (in shares)		291,667
Issuance of common stock for license agreement	425	0	425	0	0
Issuance of common stock for license agreement (in shares)		334,911
Issuance of stock	1	0	0	0	1
Issuance of stock (in shares)		0
Net loss	(12,318)	0	0	(12,317)	(1)
Balance at Dec. 31, 2013	15,230	58	96,430	(81,258)	0
Balance (in shares) at Dec. 31, 2013		58,214,326
Stock-based compensation	2,459	0	2,459	0	0
Issuance of common stock, net of issuance costs	11,647	14	11,633	0	0
Issuance of common stock, net of issuance costs (in shares)		14,059,616
Issuance of common stock for exercise of stock options	4	0	4	0	0
Issuance of common stock for exercise of stock options (in shares)		6,583
Issuance of common stock for cashless exercise of warrants	0	0	0	0	0
Issuance of common stock for cashless exercise of warrants (in shares)		232,619
Net loss	(19,784)	0	0	(19,784)	0
Balance at Dec. 31, 2014	$ 9,556	$ 72	$ 110,526	$ (101,042)	$ 0
Balance (in shares) at Dec. 31, 2014		72,513,144