Note 6 — Other Financial Information

Prepaid Expenses

Prepaid expenses consist of the following at December 31 (in thousands):


	2011		2010
Laboratory supplies	$	1,616	$	784
Other prepaid expenses		825		558
Prepaid expenses	$	2,441	$	1,342

Property and Equipment, net

Property and equipment is comprised of the following at December 31 (in thousands):


	2011			2010
Construction in progress	$	56		$	522
Machinery and equipment		7,131			6,697
Leasehold improvements		4,548			4,531
Computer software and hardware		669			554
		12,404			12,304
Less accumulated depreciation and amortization		(5,547	)		(4,098	)
Property and equipment, net	$	6,857		$	8,206

Depreciation and amortization expense was approximately $1.6 million, $1.4 million and $1.2 million for the years ended December 31, 2011, 2010 and 2009, respectively.

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consist of the following at December 31 (in thousands):


	2011		2010
Employee benefits and compensation	$	2,283	$	2,293
Research and development accruals		1,213		3,421
Other accrued expenses		1,000		535
Accrued interest		32		24
Accrued expenses and other current liabilities	$	4,528	$	6,273