Other Financial Information (Tables)

12 Months Ended

Dec. 31, 2012

Other Financial Information [Abstract]

Prepaid Expenses

	2012		2011
Laboratory supplies	$	1,592	$	1,616
Other prepaid expenses		967		825
Prepaid expenses	$	2,559	$	2,441

Property and Equipment, Net

	2012			2011
Construction in progress	$	5,248		$	56
Machinery and equipment		8,035			7,131
Leasehold improvements		4,629			4,548
Computer software and hardware		698			669
		18,610			12,404
Less accumulated depreciation and amortization		(7,154	)		(5,547	)
Property and equipment, net	$	11,456		$	6,857

Accrued Expenses and Other Current Liabilities

	2012		2011
Employee benefits and compensation	$	3,242	$	2,283
Research and development accruals		3,396		1,213
Other accrued expenses		592		1,000
Accrued interest		45		32
Accrued expenses and other current liabilities	$	7,275	$	4,528