Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 37,780	$ 32,980
Marketable securities	34,783	49,211
Accounts receivable, net	15,303	5,054
Interest receivable	493	483
Inventories	11,145	7,152
Prepaid expenses and other current assets	3,298	2,052
Deferred financing costs, current	166	229
Total current assets	102,968	97,161
Property and equipment, net	2,500	2,554
Intangible assets, net	4,135	1,158
Long term marketable securities	15,763	8,756
Other non-current assets	360	361
Deferred financing costs, long-term	599	1,005
Total assets	126,325	110,995
Current liabilities:
Accounts payable and accrued expenses	21,983	18,314
Deferred product revenue, net		7,882
Deferred licensing revenue	143	204
Total current liabilities	22,126	26,400
Deferred licensing revenue, net of current portion	1,310	1,417
Convertible notes, net of discount	26,497	34,393
Other non-current liabilities	3,015	2,677
Derivative liabilities	7,258	12,644
Total liabilities	60,206	77,531
Stockholders' equity:
Common stock, $0.001 par value, 130,000,000 shares authorized at September 30, 2014 and December 31, 2013; 42,929,826 and 39,983,437 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	43	40
Additional paid-in capital	229,123	211,952
Accumulated other comprehensive income	(35)
Accumulated deficit	(163,012)	(178,528)
Total stockholders' equity	66,119	33,464
Total liabilities and stockholders' equity	$ 126,325	$ 110,995