Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 36,396	$ 32,980
Marketable securities	37,940	49,211
Accounts receivable, net	17,270	5,054
Inventories, net	13,441	7,152
Prepaid expenses and other current assets	3,845	2,764
Total current assets	108,892	97,161
Long term marketable securities	19,816	8,756
Property and equipment, net	2,448	2,554
Intangible assets, net	5,434	1,158
Other non-current assets	918	1,366
Total assets	137,508	110,995
Current liabilities:
Accounts payable	1,863	3,142
Accrued expenses	25,487	15,172
Deferred product revenue, net		7,882
Deferred licensing revenue	143	204
Total current liabilities	27,493	26,400
Deferred licensing revenue, net of current portion	1,274	1,417
Convertible notes, net of discount	26,947	34,393
Other non-current liabilities	3,876	2,677
Derivative liabilities	6,564	12,644
Total liabilities	66,154	77,531
Stockholders' equity:
Common stock, $0.001 par value, 130,000,000 shares authorized at December 31, 2014 and 2013; 42,974,463 and 39,983,437 shares issued and outstanding at December 31, 2014 and 2013, respectively	43	40
Additional paid-in capital	230,122	211,952
Accumulated other comprehensive loss	(154)
Accumulated deficit	(158,657)	(178,528)
Total stockholders' equity	71,354	33,464
Total liabilities and stockholders' equity	$ 137,508	$ 110,995