Commitments and Contingencies (Lease and Purchase Commitments Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($)
Commitments And Contingencies Lease And Purchase Commitments Narrative Details
Description of Lessor Leasing Arrangements, Operating Leases	In July 2017, we entered into a 65 month facility lease amendment on 31,142 square feet of combined use office, laboratory and manufacturing space at our headquarters facility in Redmond, Washington. The lease commenced in October 2017 and includes 7,225 square feet expansion space on our existing premise of 23,917 square feet. The lease agreement includes extension and rent escalation provisions over the term of the lease.
Open purchase obligations	$ 5.4
Accrued liability for loss on commitments to purchase materials to support production of PicoP based products	$ 0.5

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A general description of the nature of the existing leasing arrangements of a lessor for all operating leases including, but not limited to: (1) guarantees or indemnities; (2) restrictions imposed by lease arrangements; (3) unusual provisions or conditions; (4) contingent rentals; and (5) lease expiration dates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84164561&loc=d3e37045-112695

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

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Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03(a)(19))
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-Publisher FASB
-Name Accounting Standards Codification
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