Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property and equipment consist of the following (in thousands):



	December 31,
	2019			2018
Leasehold improvements	$	5,321		$	4,804
Laboratory and clean room equipment	14,894			13,787
Furniture and equipment	15,118			15,145
Construction in progress	972			1,507
Property and equipment, gross	36,305			35,243
Less accumulated depreciation and amortization	(23,977		)	(17,819		)
Property and equipment, net	$	12,328		$	17,424

Schedule of Depreciation

Depreciation expense for each of the years ended December 31, 2019, 2018, and 2017 was recorded in certain captions of the consolidated statements of operations for those periods in the amounts shown in the table below (in thousands):



	For the year ended December 31,
	2019		2018		2017
Cost of sales	$	1,965	$	1,757	$	1,417
Selling, general and administrative expenses	4,223		3,760		2,354
Research and development expenses	358		365		316
Total	$	6,546	$	5,882	$	4,087