CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 71,018	$ 22,781
Short-term investments	25,698	28,513
Investment in marketable equity securities	11,163
Accounts receivable	5,794	5,493
Inventories	10,812	14,956
Prepaid expenses	1,166	1,210
Other current assets	4,788	1,932
Total current assets	130,439	74,885
Non-current assets:
Property and equipment, net	3,549	3,781
Goodwill	1,316	1,316
Intangible assets, net	940	1,142
Restricted cash	612	508
Other assets	2,614	144
Total assets	139,470	81,776
Current liabilities:
Accounts payable	5,217	9,882
Accrued liabilities	9,853	8,444
Manufacturing and development obligations-current	3,282
Debt-current	2,989
Deferred revenue-current	554	376
Warrant liability		10,485
Total current liabilities	21,895	29,187
Non-current liabilities:
Debt-non-current	16,883	9,872
Deferred income taxes	122	115
Manufacturing and development obligations-non-current	4,542
Other non-current liabilities	1,263	1,081
Total liabilities	$ 44,705	$ 40,255
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000 shares authorized, issuable in series; zero shares issued and outstanding at December 31, 2015 and 2014, respectively
Common stock, $0.001 par value; 225,000 shares authorized; 99,095 and 80,404 shares issued and outstanding at December 31, 2015 and 2014, respectively	$ 99	$ 80
Additional paid-in capital	685,189	583,416
Accumulated other comprehensive income (loss)	7,289	(31)
Accumulated deficit	(597,812)	(541,944)
Total stockholders' equity	94,765	41,521
Total liabilities and stockholders' equity	$ 139,470	$ 81,776