Balance Sheets and Statements of Operations Details

Inventories

Inventories, net consisted of the following (in thousands):



	December 31,
	2013		2012
Raw materials	$	763	$	588
Work in process	31		52
Finished goods	693		662
Total inventories	$	1,487	$	1,302

Property and Equipment, net

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



	December 31,
	2013			2012
Laboratory equipment	$	23,949		$	33,776
Leasehold improvements	9,493			4,388
Computer equipment and software	3,196			11,099
Office equipment and furniture	1,228			1,531
Construction in progress (1)	41			28
	37,907			50,822
Less: accumulated depreciation and amortization	(29,461		)	(34,172		)
Property and equipment, net	$	8,446		$	16,650


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

Intangible Assets

Intangible assets consisted of the following (in thousands):



	December 31, 2013							December 31, 2012
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted- Average Amortization Period
															(years)
Customer relationships	$	3,098	$	(3,098	)	$	—	$	3,098	$	(3,098	)	$	—	5
Developed and core technology	1,534		(1,534		)	—		1,534		(1,534		)	—		5
Maxygen intellectual property	20,244		(10,684		)	9,560		20,244		(7,310		)	12,934		6
Total	$	24,876	$	(15,316	)	$	9,560	$	24,876	$	(11,942	)	$	12,934	6

The estimated future amortization expense to be charged to research and development through the year ending December 31, 2016 is as follows (in thousands):



Year ending December 31:	Total
2014	$	3,374
2015	3,374
2016	2,812
	$	9,560

Goodwill

There were no changes in the carrying value of goodwill of $3,241,000 during 2013 and 2012.

Interest Expense and Other, Net

Interest expense and other, net consisted of the following (in thousands):



	Years Ended December 31,
	2013			2012			2011
Interest expense	$	13		$	—		$	—
Foreign exchange losses	305			348			706
Other	(14		)	(22		)	(31		)
Interest expense and other, net	$	304		$	326		$	675