Income Taxes (Tax Effects of Temporary Differences That Give Rise to Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Taxes Tax Effects Of Temporary Differences That Give Rise To Deferred Tax Assets Details
Net operating loss carryforward	$ 132,101	$ 140,416
Research credit carryforward	68,277	49,960
Capital loss carryforward	4,186	4,169
Non-recourse debt	27,769	32,619
Acquired intellectal property	29,452	29,287
Capitalization of inventory	9,429	13,146
Stock compensation expense	2,935	5,631
Accrued compensation	3,117	2,105
Other	555	273
Total gross deferred tax assets	277,821	277,606
Less valuation allowance	(277,821)	(277,606)
Deferred tax assets	0	0
Deferred tax liabilities	0	0
Net deferred tax asset (liability)	$ 0	$ 0