Consolidated Statements Of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Total
Balances, value at Dec. 31, 2014		$ 1,268,243	$ (733)	$ (1,231,897)	$ 35,613
Balances, shares at Dec. 31, 2014	4,832
Net loss				(11,437)	(11,437)
Other comprehensive income (loss)			(6)		(6)
Stock-based compensation		1,064			1,064
Issuance of common stock from restricted stock award, shares	9
Issuance of common stock from restricted stock award, value
Issuance of common stock under employee stock purchase plan, shares	54
Issuance of common stock under employee stock purchase plan, value		275			275
Issuance of common stock from exercise of options, shares
Issuance of common stock from exercise of options, value
Balances, shares at Dec. 31, 2015	4,895				4,895
Balances, value at Dec. 31, 2015		1,269,582	(739)	(1,243,334)	$ 25,509
Net loss				(9,485)	(9,485)
Other comprehensive income (loss)			(228)		(228)
Stock-based compensation		875			875
Issuance of common stock from restricted stock award, shares	23
Issuance of common stock from restricted stock award, value
Issuance of common stock under employee stock purchase plan, shares	38
Issuance of common stock under employee stock purchase plan, value		181			181
Issuance of common stock from exercise of options, shares	2
Issuance of common stock from exercise of options, value		11			$ 11
Balances, shares at Dec. 31, 2016	4,958				4,958
Balances, value at Dec. 31, 2016		$ 1,270,649	$ (967)	$ (1,252,819)	$ 16,863