Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Net operating loss carryforwards	$ 28,625	$ 37,501
Research and development credit carryforwards	10,143	10,600
Intangibles	388
Other	4,627	5,455
Deferred tax assets, gross	43,783	53,556
Valuation allowance	(42,932)	(50,606)
Total deferred tax assets	851	2,950
Intangibles		(9,569)
Other	(635)
Total deferred tax liabilities	(635)	(9,569)
Net deferred tax liabilities	$ 216	$ (6,619)