Income Taxes (Tax Rate Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Rate Reconciliation
Tax benefit at federal statutory rate	$ (6,571)	$ (14,073)	$ (10,399)
State taxes	249	(1,948)	(1,063)
Research and development credits	(57)	(195)	0
Foreign operations taxed at different rates	447	(108)	7
Stock-based compensation	(2)	117	312
Other nondeductible items	(364)	(1,272)	204
Change in federal statutory rate	0	0	1,493
Change in valuation allowance	6,042	17,392	9,716
Total provision for (benefit from) income taxes	$ (256)us-gaap_IncomeTaxExpenseBenefit	$ (87)us-gaap_IncomeTaxExpenseBenefit	$ 270us-gaap_IncomeTaxExpenseBenefit

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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