Balance Sheets (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 24,876	$ 24,876
Accumulated Amortization	(18,690)	(15,316)
Net Carrying Amount	6,186us-gaap_FiniteLivedIntangibleAssetsNet	9,560us-gaap_FiniteLivedIntangibleAssetsNet
Weighted- Average Amortization Period (years)	6 years
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,098	3,098
Accumulated Amortization	(3,098)	(3,098)
Net Carrying Amount	0	0
Weighted- Average Amortization Period (years)	5 years
Developed and core technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,534	1,534
Accumulated Amortization	(1,534)	(1,534)
Net Carrying Amount	0	0
Weighted- Average Amortization Period (years)	5 years
Maxygen intellectual property [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	20,244	20,244
Accumulated Amortization	(14,058)	(10,684)
Net Carrying Amount	$ 6,186	$ 9,560
Weighted- Average Amortization Period (years)	6 years

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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