Selected Balance Sheet Components

Inventory as of March 31, 2016 and December 31, 2015:

Property and equipment, net as of March 31, 2016 and December 31, 2015:



(In thousands)	March 31, 2016			December 31, 2015
Machinery and equipment	$	3,185		$	3,280
Furniture, fixtures and office equipment	931			931
Computer equipment and software	2,662			2,662
Leasehold improvements	2,393			2,393
Construction in process	1,140			421
Total property and equipment, gross	10,311			9,687
Less: Accumulated depreciation	(5,918		)	(5,638		)
	$	4,393		$	4,049

Depreciation expense for the three months ended March 31, 2016 and 2015 was $0.4 million and $0.3 million, respectively.

Intangible assets, net as of March 31, 2016 and December 31, 2015:



(In thousands)	March 31, 2016			December 31, 2015
Commercial rights	$	3,360		$	3,360
Less: accumulated amortization	$	(513	)	$	(443	)
	$	2,847		$	2,917

Amortization expense was $0.1 million for both the three months ended March 31, 2016 and 2015.

Estimated future amortization expense is as follows:



Calendar Years Ending December 31, (In thousands)
2016	$	210
2017	280
2018	280
2019	280
2020	280
Thereafter	1,517
Total	$	2,847

Accrued expenses as of March 31, 2016 and December 31, 2015: