Balance Sheets Details

Inventories

Inventories consisted of the following (in thousands):

Property and Equipment, net

Property and equipment, net consisted of the following (in thousands):



	June 30, 2016			December 31, 2015
Laboratory equipment	$	20,285		$	20,503
Leasehold improvements	10,395			10,369
Computer equipment and software	3,284			3,271
Office equipment and furniture	1,179			1,178
Construction in progress ⁽¹⁾	—			3
Property and equipment	35,143			35,324
Less: accumulated depreciation and amortization	(32,740		)	(32,215		)
Property and equipment, net	$	2,403		$	3,109

(1) Construction in progress includes equipment received but not yet placed into service pending installation.

Intangible Assets, net

Intangible assets, net consisted of the following (in thousands, except weighted average amortization period):



	June 30, 2016							December 31, 2015
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Amortization Period (years)
Developed and core technology	$	1,534	$	(1,534	)	$	—	$	1,534	$	(1,534	)	$	—	5
Maxygen intellectual property	20,244		(19,119		)	1,125		20,244		(17,432		)	2,812		6
Intangible assets, net	$	21,778	$	(20,653	)	$	1,125	$	21,778	$	(18,966	)	$	2,812

The remaining estimated future amortization expense to be charged to research and development through December 31, 2016 is $1.125 million.

Goodwill

Goodwill had a carrying value of approximately $3.2 million at June 30, 2016 and December 31, 2015.