Condensed Consolidated Statements of Changes in Equity (unaudited) - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands	Class A Common Stock	Additional Paid - in Capital	Business Combination Consideration to be Transferred	Accumulated Deficit	Total
Balances at Dec. 31, 2014	$ 5	$ 140,124	$ 1,244	$ (146,674)	$ (5,301)
Balances (in shares) at Dec. 31, 2014	2,601,284
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock and other equity changes related to compensation		531			531
Issuance of common stock and other equity changes related to compensation (in shares)	14,933
Proceeds from February 2015 Offering and warrant exercises, net of costs	$ 3	10,639			10,642
Proceeds from February 2015 Offering and warrant exercises, net of costs (in shares)	3,021,581
Proceeds from June 2015 Offering, net of costs		4,408			4,408
Proceeds from June 2015 Offering, net of costs (in shares)	4,021,884
Establishment of liability related to common stock warrant issuance		(12,246)			(12,246)
Adjustment to common stock warrant liability for warrants exercised/extinguished		7,262			7,262
Adjustment to common stock warrant liability for warrants exercised/extinguished (in shares)	1,328,004
Related party debt conversion		4,238			4,238
Related party debt conversion ( in share)	1,288,156
Business combination consideration		1,244	$ (1,244)
Business combination consideration (in shares)	22,631
Fractional shares issued in connection with reverse split	2,700
Net loss				(6,570)	(6,570)
Balances at Sep. 30, 2015	$ 8	$ 156,200		$ (153,244)	$ 2,964
Balances (in shares) at Sep. 30, 2015	12,301,173