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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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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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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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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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Amount of increase (decrease) of physical assets used in the normal conduct of business and not intended for resale, from reclassification, impairment, donation, or changes classified as other. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 15,555		$ 15,555		$ 11,474
Accumulated depreciation	(8,143)		(8,143)		(6,584)
Property and equipment, net	7,412		7,412		4,890
Depreciation	662	$ 550	1,700	$ 1,600
Transfer of instruments from inventory to property and equipment	1,200		1,900
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	2,801		2,801		2,756
Technical equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	3,820		3,820		3,348
Facilities
Property, Plant and Equipment [Line Items]
Total property and equipment	4,006		4,006		3,621
Instruments
Property, Plant and Equipment [Line Items]
Total property and equipment	4,821		4,821		1,400
Capital projects in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 107		$ 107		$ 349