Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Current assets:
Cash and cash equivalents	$ 19,830	$ 33,498	$ 25,158
Marketable securities	25,427	28,692	39,678
Accounts receivable, net	30,651	25,908	19,271
Inventories, net	13,044	12,587	13,702
Prepaid expenses and other current assets	5,003	5,261	3,640
Total current assets	93,955	105,946	101,449
Long term marketable securities	68,790	55,009	27,315
Property and equipment, net	3,866	3,874	2,481
Deferred legal fees	11,444	22,503	7,672
Intangible assets, net	16,108	976	167
Other non-current assets	311	318	321
Total assets	194,474	188,626	139,405
Current liabilities:
Accounts payable	2,646	4,314	859
Accrued sales deductions	28,697	26,794	10,025
Accrued expenses	22,915	25,153	16,482
Non-recourse liability related to sale of future royalties - current portion	1,067	497
Deferred licensing revenue	208	176	143
Total current liabilities	55,533	56,934	27,509
Deferred licensing revenue, net of current portion	1,658	1,390	1,238
Convertible notes, net	5,627	7,085	11,476
Non-recourse liability related to sale of future royalties - long term	29,621	30,031	30,179
Other non-current liabilities	4,391	4,325	2,561
Derivative liabilities	535	854	2,691
Total liabilities	97,365	100,619	75,654
Stockholders' equity:
Common stock, $0.001 par value, 130,000,000 shares authorized at March 31, 2016, December 31, 2015 and March 31, 2015; 49,421,236, 49,004,674 and 47,513,429 shares issued and outstanding at March 31, 2016, December 31, 2015 and March 31, 2015, respectively	49	49	48
Additional paid-in capital	267,576	263,955	252,483
Accumulated other comprehensive income (loss)	168	(488)	(65)
Accumulated deficit	(170,684)	(175,509)	(188,715)
Total stockholders' equity	97,109	88,007	63,751
Total liabilities and stockholders' equity	$ 194,474	$ 188,626	$ 139,405