Consolidated Statements of Stockholders` Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total
Balance at Dec. 31, 2013	$ 93	$ 188,108	$ (1,036)	$ (181,719)	$ 5,446
Balance (in shares) at Dec. 31, 2013	9,299,000
Increase (decrease) in stockholders' equity
Net loss				(9,336)	(9,336)
Foreign currency translation adjustment			(1,829)		(1,829)
Proceeds from equity offerings, net of costs	$ 34	7,346			7,380
Proceeds from equity offerings, net of costs (in shares)	3,415,000
Issuance of common stock for settlement of litigation	$ 1	235			236
Issuance of common stock for settlement of litigation (in shares)	75,000
Exercise of warrants	$ 10	3,938			3,948
Exercise of warrants (in shares)	968,000
Exercise of stock options	$ 2	523			525
Exercise of stock options (in shares)	179,000
Restricted stock unit vesting	$ 2				2
Restricted stock unit vesting (in shares)	217,000
Restricted stock units withheld for taxes		(18)			(18)
Stock-based compensation		639			639
Balance at Dec. 31, 2014	$ 142	200,771	(2,865)	(191,055)	$ 6,993
Balance (in shares) at Dec. 31, 2014	14,153,000				14,152,772
Increase (decrease) in stockholders' equity
Net loss				(8,534)	$ (8,534)
Foreign currency translation adjustment			(2,522)		(2,522)
Proceeds from equity offerings, net of costs	$ 34	3,697			3,731
Proceeds from equity offerings, net of costs (in shares)	3,384,000
Restricted stock unit vesting	$ 2				2
Restricted stock unit vesting (in shares)	261,000
Stock-based compensation		767			767
Balance at Dec. 31, 2015	$ 178	$ 205,235	$ (5,387)	$ (199,589)	$ 437
Balance (in shares) at Dec. 31, 2015	17,798,000				17,797,652