Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 16,975	$ 15,888
Accumulated depreciation and amortization	(10,299)	(9,218)
Property and equipment, net	6,676	6,670
Machinery, Manufacturing and Demonstration Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	11,894	10,866
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	2,260	2,187
Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	592	598
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 2,229	$ 2,237

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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