Selected Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2018

Balance Sheet Related Disclosures [Abstract]

Schedule of inventory

Inventory as of March 31, 2018 and December 31, 2017:

(In thousands)	March 31, 2018		December 31, 2017
Raw materials	$	3,537	$	3,532
Work-in-process	342		226
Finished goods	26		35
Inventory	$	3,905	$	3,793

Schedule of property and equipment, net

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

(In thousands)	March 31, 2018			December 31, 2017
Machinery and equipment	$	1,249		$	1,249
Furniture, fixtures and office equipment	872			872
Computer equipment and software	3,584			3,536
Leasehold improvements	4,255			4,213
Construction in process	1,295			822
Total property and equipment, gross	11,255			10,692
Less: Accumulated depreciation	(7,048		)	(6,621		)
	$	4,207		$	4,071

Schedule of accounts payable and accrued expenses

Accrued expenses as of March 31, 2018 and December 31, 2017:

(In thousands)	March 31, 2018		December 31, 2017
Bonus related compensation	$	752	$	2,693
Employee related accruals	2,577		2,389
Clinical trial related accruals	678		491
	$	4,007	$	5,573