CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue:
Product revenue	$ 10,542	$ 8,252	$ 30,425	$ 26,167
Cost of product revenue	6,826	4,411	17,663	15,499
Gross profit on product revenue	3,716	3,841	12,762	10,668
Government grants and cooperative agreements revenue				91
Operating expenses:
Research and development	4,363	1,903	10,569	5,439
Selling, general and administrative	7,728	6,219	22,535	18,871
Amortization of intangible assets	50	50	151	151
Total operating expenses	12,141	8,172	33,255	24,461
Loss from operations	(8,425)	(4,331)	(20,493)	(13,702)
Non-operating income (expense), net:
Revaluation of warrant liability	(12,416)	873	(16,803)	86
Foreign exchange gain (loss)	409	187	198	(53)
Interest expense	(41)	(136)	(279)	(410)
Other income, net	32	2	65	9
Total non-operating income (expense), net	(12,016)	926	(16,819)	(368)
Loss before income taxes	(20,441)	(3,405)	(37,312)	(14,070)
Provision for income taxes	60	55	165	131
Net loss	$ (20,501)	$ (3,460)	$ (37,477)	$ (14,201)
Net loss per common share:
Basic	$ (0.29)	$ (0.06)	$ (0.56)	$ (0.26)
Diluted	$ (0.29)	$ (0.08)	$ (0.56)	$ (0.26)
Weighted average common shares outstanding used for calculating net loss per common share:
Basic	69,791	54,875	66,464	54,130
Diluted	69,791	55,377	66,464	54,130