Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 87,372	$ 48,164
Short-term investments	10,400	50,334
Restricted cash	238	238
Accounts receivable	15,259	12,076
Inventory	505	178
Prepaid expenses and other assets	2,055	2,180
Total current assets	115,829	113,170
Property and equipment, net	1,476	2,245
Intangible asset, net	4,772	5,225
Other assets		116
Total assets	122,077	120,756
LIABILITIES AND STOCKHOLDERS' EQUITY
Trade accounts payable	1,503	4,931
Deferred revenue	3,521
Accrued liabilities	15,940	17,627
Total current liabilities	20,964	22,558
Long-term deferred revenue and other liabilities	21,809
Commitments and contingencies (Note 10)
Stockholders' equity:
Common stock, $0.001 par value; 200,000,000 shares authorized; 106,260,526 and 105,493,546 shares issued and outstanding at December 31, 2011 and December 31, 2010, respectively	106	105
Additional paid-in capital	560,354	548,722
Accumulated deficit	(481,156)	(450,629)
Total stockholders' equity	79,304	98,198
Total liabilities and stockholders' equity	122,077	120,756
Preferred Stock [Member]
Stockholders' equity:
Preferred stock, $0.001 par value; no shares issued or outstanding
Series A Junior Participating Preferred Stock
Stockholders' equity:
Preferred stock, $0.001 par value; no shares issued or outstanding