STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total
Balance at Dec. 31, 2013	$ 14	$ 280,398	$ (22)	$ (275,780)	$ 4,610
Balance (in shares) at Dec. 31, 2013	13,678
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss				(2,515)	(2,515)
Unrealized change in investments, net			(11)		(11)
Restricted stock issued under stock benefit plans	$ 3	10,663			10,666
Restricted stock issued under stock benefit plans (in shares)	3,592
Stock-based compensation		548			548
Balance at Dec. 31, 2014	$ 17	291,609	(33)	(278,295)	13,298
Balance (in shares) at Dec. 31, 2014	17,270
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss				(6,545)	(6,545)
Unrealized change in investments, net			28		28
Cost of common stock issued under shelf registration		(24)			(24)
Cost of common stock issued under shelf registration (in shares)	(6)
Stock-based compensation		923			923
Balance at Dec. 31, 2015	$ 17	$ 292,508	$ (5)	$ (284,840)	$ 7,680
Balance (in shares) at Dec. 31, 2015	17,264