Income Taxes (Schedule of Income Tax Effect of Each Type of Temporary Difference and Carryforward) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Approximate income tax effect of each type of temporary difference and carryforward:
Net operating loss carry-forwards	$ 42,633	$ 30,763
Tax credit carry-forwards	6,482	5,211
Stock-based compensation	2,608	3,502
Intangible assets	(6,600)	(3,469)
Fixed assets	246	85
Account receivable reserves	970	966
Accrued compensation	1,463	53
Capitalized research and development costs		47
Capitalized start-up costs	420	481
Other temporary differences	(334)us-gaap_DeferredTaxAssetsOther	1,121us-gaap_DeferredTaxAssetsOther
Deferred tax assets	47,888us-gaap_DeferredTaxAssetsGross	38,760us-gaap_DeferredTaxAssetsGross
Valuation allowance	(47,779)	(38,635)
Net deferred tax assets	$ 109us-gaap_DeferredTaxAssetsNet	$ 125us-gaap_DeferredTaxAssetsNet

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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