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Property and Equipment, net (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Property and Equipment, Net [Abstract]
Property and equipment, gross		$ 46,654		$ 46,654		$ 45,465
Less: accumulated depreciation and amortization		(34,443)		(34,443)		(32,005)
Total property and equipment, net		12,211		12,211		13,460
Property Plant and Equipment Income Statement Disclosures [Abstract]
Total depreciation and amortization		733	$ 944	2,438	$ 2,797
Machinery [Member]
Property and Equipment, Net [Abstract]
Property and equipment, gross		20,440		$ 20,440		20,056
Machinery [Member] | Minimum [Member]
Property and Equipment, Net [Abstract]
Useful lives				3 years
Machinery [Member] | Maximum [Member]
Property and Equipment, Net [Abstract]
Useful lives				15 years
Furniture and Fixtures [Member]
Property and Equipment, Net [Abstract]
Property and equipment, gross		1,142		$ 1,142		1,109
Furniture and Fixtures [Member] | Minimum [Member]
Property and Equipment, Net [Abstract]
Useful lives				3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property and Equipment, Net [Abstract]
Useful lives				15 years
Leasehold Improvements [Member]
Property and Equipment, Net [Abstract]
Property and equipment, gross	[1]	21,314		$ 21,314		21,271
Computer, Network Equipment and Software [Member]
Property and Equipment, Net [Abstract]
Property and equipment, gross		2,287		$ 2,287		2,108
Computer, Network Equipment and Software [Member] | Minimum [Member]
Property and Equipment, Net [Abstract]
Useful lives				3 years
Computer, Network Equipment and Software [Member] | Maximum [Member]
Property and Equipment, Net [Abstract]
Useful lives				7 years
Construction in Progress [Member]
Property and Equipment, Net [Abstract]
Property and equipment, gross		$ 1,471		$ 1,471		$ 921
[1] Leasehold improvements are amortized over the shorter of the lease term or their estimated useful lives.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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