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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Payment extension term to customers.

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Balance Sheet Detail (Details) - USD ($) $ in Thousands	3 Months Ended
Balance Sheet Detail (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Equipment and leasehold improvements
Equipment and leasehold improvements, gross	$ 3,562		$ 3,478
Less accumulated depreciation and amortization	(2,023)		(1,890)
Equipment and leasehold improvements, net	1,539		1,588
Depreciation and amortization expense	$ 135	$ 114
Minimum
Equipment and leasehold improvements
Payment extension term to customers	12 months
Maximum
Equipment and leasehold improvements
Payment extension term to customers	48 months
Equipment
Equipment and leasehold improvements
Equipment and leasehold improvements, gross	$ 2,229		2,146
Leasehold improvements
Equipment and leasehold improvements
Equipment and leasehold improvements, gross	1,333		$ 1,332
General and Administrative Expense
Equipment and leasehold improvements
Depreciation and amortization expense	$ 100	$ 100