Consolidated Statements of Stockholders' Equity and Comprehensive Income (USD $) In Thousands, unless otherwise specified	Total	Common stock	Additional paid-in capital	Other comprehensive income	Accumulated deficit
Beginning Balances at Dec. 31, 2008	$ 59,297	$ 30	$ 1,064,614	$ 250	$ (1,005,597)
Beginning Balances (in shares) at Dec. 31, 2008		30,137
Exercise of stock options for cash (in shares)		20
Exercise of stock options for cash	13		13
Issuance of common stock in connection with employee stock purchase plan (in shares)		83
Issuance of common stock in connection with employee stock purchase plan	87		87
Issuance of common stock for director services (in shares)		32
Issuance of common stock for director services	66		66
Stock-based compensation	2,194		2,194
Comprehensive loss:
Net loss	(10,027)				(10,027)
Foreign currency translation adjustment	48			48
Unrealized loss on available for sale securities	(5)			(5)
Total comprehensive loss	(9,984)
Ending Balances at Dec. 31, 2009	51,673	30	1,066,974	293	(1,015,624)
Ending Balances (in shares) at Dec. 31, 2009		30,272
Exercise of stock options for cash (in shares)		104
Exercise of stock options for cash	75		75
Issuance of common stock in connection with employee stock purchase plan (in shares)		151
Issuance of common stock in connection with employee stock purchase plan	199		199
Issuance of common stock for director services (in shares)		28
Issuance of common stock for director services	69		69
Stock-based compensation	2,196		2,196
Comprehensive loss:
Net loss	(4,781)				(4,781)
Foreign currency translation adjustment	(16)			(16)
Total comprehensive loss	(4,797)
Ending Balances at Dec. 31, 2010	49,415	30	1,069,513	277	(1,020,405)
Ending Balances (in shares) at Dec. 31, 2010		30,555
Exercise of stock options for cash (in shares)		109
Exercise of stock options for cash	77		77
Issuance of common stock in connection with employee stock purchase plan (in shares)		131
Issuance of common stock in connection with employee stock purchase plan	131	1	130
Issuance of common stock for director services (in shares)		25
Issuance of common stock for director services	61		61
Stock-based compensation	1,609		1,609
Comprehensive loss:
Net loss	(11,726)				(11,726)
Foreign currency translation adjustment	(40)			(40)
Total comprehensive loss	(11,766)
Ending Balances at Dec. 31, 2011	$ 39,527	$ 31	$ 1,071,390	$ 237	$ (1,032,131)
Ending Balances (in shares) at Dec. 31, 2011		30,820