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.

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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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