Correction of Treatment for Liabilities - Adjustment of Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred revenue	$ 2,303	$ 3,482
Accrued liabilities and other	2,816	4,359
Other long-term liabilities	29	343
Accumulated deficit	(743,169)	(757,076)
Scenario, Previously Reported [Member]
Deferred revenue		3,500
Accrued liabilities and other		3,409
Other long-term liabilities		71
Accumulated deficit		$ (755,872)