Quarterly Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Information (unaudited) [Abstract]

Unaudited Quarterly Financial Information

The following unaudited quarterly financial information includes, in management's opinion, all the normal and recurring adjustments necessary to fairly state the results of operations and related information for the periods presented.

	For the three months ended
	March 31, 2012			June 30, 2012			September 30, 2012			December 31, 2012

Product revenues	$	1,481,000		$	1,947,000		$	1,314,000		$	3,967,000
Gross profit		628,000			915,000			611,000			2,555,000
Development revenues		3,000			2,429,000			2,000			3,358,000
Operating expenses		8,996,000			10,304,000			10,945,000			8,674,000
Other income (expense)		(960,000	)		(923,000	)		(916,000	)		(1,062,000	)
Net loss	$	(9,325,000	)	$	(7,883,000	)	$	(11,248,000	)	$	(3,823,000	)
Basic and diluted net loss per share	$	(0.16	)	$	(0.13	)	$	(0.19	)	$	(0.06	)

	For the three months ended
	March 31, 2011			June 30, 2011			September 30, 2011			December 31, 2011

Product revenues	$	1,362,000		$	2,411,000		$	2,134,000		$	2,076,000
Gross profit		520,000			1,302,000			1,192,000			1,132,000
Development revenues		1,235,000			11,000			5,000			762,000
Operating expenses		12,998,000			5,685,000			9,020,000			7,868,000
Other income (expense)		(829,000	)		(766,000	)		(512,000	)		(932,000	)
Net loss	$	(12,072,000	)	$	(5,138,000	)	$	(8,335,000	)	$	(6,906,000	)
Basic and diluted net loss per share	$	(0.23	)	$	(0.10	)	$	(0.15	)	$	(0.13	)