Selected Balance Sheet Components - (Tables)

6 Months Ended

Jun. 30, 2019

Balance Sheet Related Disclosures [Abstract]

Schedule of inventory

Inventory as of June 30, 2019 and December 31, 2018:

(In thousands)	June 30, 2019		December 31, 2018
Raw materials	$	4,127	$	2,872
Work-in-process	596		638
Finished goods	65		48
Inventory	$	4,788	$	3,558

Schedule of property and equipment, net

Property and equipment, net as of June 30, 2019 and December 31, 2018: 

(In thousands)	June 30, 2019			December 31, 2018
Machinery and equipment	$	2,456		$	1,536
Furniture, fixtures and office equipment	775			775
Computer equipment and software	5,906			3,712
Leasehold improvements	4,631			4,587
Construction in process	1,230			2,801
Financing right-of-use lease	166			—
Total property and equipment, gross	15,164			13,411
Less: Accumulated depreciation	(8,201		)	(7,505		)
	$	6,963		$	5,906

Depreciation expense for the three and six months ended June 30, 2019 was $0.4 million and $0.7 million and $0.4 million and $0.8 million for the same period in 2018.

Schedule of accounts payable and accrued expenses

Accrued expenses as of June 30, 2019 and December 31, 2018:

(In thousands)	June 30, 2019		December 31, 2018
Bonus related compensation	$	1,528	$	5,161
Employee related accruals	2,695		1,559
Other accrued expenses	478		210
	$	4,701	$	6,930