Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 32,980	$ 40,302
Marketable securities	49,211	48,206
Accounts receivable, net	5,054	11
Interest receivable	483	664
Inventories	7,152	1,152
Prepaid expenses and other current assets	2,052	983
Deferred financing costs, current	229	144
Total current assets	97,161	91,462
Property and equipment, net	2,554	1,421
Intangible assets, net	1,158	683
Long term investments	8,756
Other non-current assets	361	334
Deferred financing costs, long-term	1,005	89
Total assets	110,995	93,989
Current liabilities:
Accounts payable and accrued expenses	18,314	10,666
Deferred product revenue, net	7,882
Deferred licensing revenue	204	508
Secured notes payable, net of discount		11,809
Total current liabilities	26,400	22,983
Deferred licensing revenue, net of current portion	1,417	309
Convertible notes, net of discount	34,393
Secured notes payable, net of current portion and discount		11,088
Other non-current liabilities	2,677	1,788
Derivative liabilities	12,644	251
Total liabilities	77,531	36,419
Stockholders' equity:
Common stock, $0.001 par value, 130,000,000 shares authorized at December 31, 2013 and 2012; 39,983,437 and 30,621,869 shares issued and outstanding at December 31, 2013 and 2012, respectively	40	31
Additional paid-in capital	211,952	143,851
Accumulated other comprehensive loss		(57)
Accumulated deficit	(178,528)	(86,255)
Total stockholders' equity	33,464	57,570
Total liabilities and stockholders' equity	$ 110,995	$ 93,989