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Commitments and Contingencies - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Feb. 28, 2018 | Dec. 31, 2017 | Feb. 28, 2017 | Dec. 31, 2015 | Sep. 30, 2015 | Nov. 30, 2014 | Aug. 31, 2012 | Mar. 31, 2011
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Rent expense |  | $ 300,000 | $ 300,000 | $ 900,000 | $ 700,000 |  |  |  |  |  |  |  |
Purchase commitments related to inventory |  | 300,000 |  | 300,000 |  |  | $ 100,000 |  |  |  |  |  |
San Jose, California |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cancelable operating lease term |  |  |  |  |  |  |  |  |  |  |  | 4 years |
Early termination fees | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Santa Clara, California |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cancelable operating lease term |  |  |  |  |  | 7 years |  |  |  |  |  |  |
Milan, Italy |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cancelable operating lease term |  |  |  |  |  |  |  |  |  | 6 years |  |  | 6 years
Lease renewal extension |  |  |  |  |  |  |  | 6 years |  |  |  |  |
Mannheim, Germany |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cancelable operating lease term |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Knaresborough, United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cancelable operating lease term |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Indemnification Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Costs to defend lawsuits or settle claims |  |  |  | 0 |  |  |  |  |  |  |  |  |
Costs accrued to defend lawsuits |  | $ 0 |  | $ 0 |  |  |  |  |  |  |  |  |

X
- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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