Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 33,110	$ 36,396
Marketable securities	36,681	37,940
Accounts receivable, net	17,900	17,270
Inventories, net	13,592	13,441
Prepaid expenses and other current assets	4,457	3,845
Total current assets	105,740	108,892
Long term marketable securities	33,488	19,816
Property and equipment, net	2,908	2,448
Intangible assets, net	11,597	5,434
Other non-current assets	435	918
Total assets	154,168	137,508
Current liabilities:
Accounts payable	4,518	1,863
Accrued expenses	31,753	25,487
Deferred licensing revenue	143	143
Total current liabilities	36,414	27,493
Deferred licensing revenue, net of current portion	1,202	1,274
Convertible notes, net of discount	8,762	26,947
Other non-current liabilities	3,355	3,876
Derivative liabilities	2,070	6,564
Total liabilities	51,803	66,154
Stockholders' equity:
Common stock, $0.001 par value, 130,000,000 shares authorized at June 30, 2015 and December 31, 2014; 48,444,821 and 42,974,463 shares issued and outstanding at June 30, 2015 and December 31, 2014, respectively	48	43
Additional paid-in capital	258,202	230,122
Accumulated other comprehensive loss	(151)	(154)
Accumulated deficit	(155,734)	(158,657)
Total stockholders' equity	102,365	71,354
Total liabilities and stockholders' equity	$ 154,168	$ 137,508