Selected Balance Sheet Components

9 Months Ended

Sep. 30, 2018

Balance Sheet Related Disclosures [Abstract]

Inventory as of September 30, 2018 and December 31, 2017:



(In thousands)	September 30, 2018		December 31, 2017
Raw materials	$	3,130	$	3,532
Work-in-process	456		226
Finished goods	52		35
Inventory	$	3,638	$	3,793

Property and equipment, net as of September 30, 2018 and December 31, 2017:



(In thousands)	September 30, 2018			December 31, 2017
Machinery and equipment	$	1,424		$	1,249
Furniture, fixtures and office equipment	757			872
Computer equipment and software	3,695			3,536
Leasehold improvements	4,459			4,213
Construction in process	2,084			822
Total property and equipment, gross	12,419			10,692
Less: Accumulated depreciation	(7,212		)	(6,621		)
	$	5,207		$	4,071

Depreciation expense for the three and nine months ended September 30 2018 was $0.3 million and $1.1 million, respectively, and $0.4 million and $1.2 million, for the same periods in 2017.

Accrued expenses as of September 30, 2018 and December 31, 2017:



(In thousands)	September 30, 2018		December 31, 2017
Bonus related compensation	$	2,180	$	2,693
Employee related accruals	2,955		2,389
Other accrued expenses	457		491
	$	5,592	$	5,573