Equipment and Leasehold Improvements (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Schedule of components of equipment and leasehold improvements

Equipment and leasehold improvements consist of the following:

	As of December 31,
	2017			2016
Machinery and equipment	$	14,936		$	14,587
Office equipment		811			790
Office furniture		110			110
Leasehold improvements		4,839			4,814
Construction in progress		157			75
		20,853			20,376
Less: Accumulated depreciation and amortization		(19,229	)		(18,981	)
	$	1,624		$	1,395