CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 20,791	$ 71,018
Short-term investments	70,513	25,698
Investment in marketable equity securities	5,082	11,163
Accounts receivable	4,086	5,794
Inventories	11,255	10,812
Prepaid expenses	1,377	1,166
Other current assets	6,333	4,755
Total current assets	119,437	130,406
Non-current assets:
Property and equipment, net	3,380	3,549
Goodwill	1,316	1,316
Intangible assets, net	890	940
Restricted cash	574	612
Other assets	2,341	2,579
Total assets	127,938	139,402
Current liabilities:
Accounts payable	6,238	5,217
Accrued liabilities	9,221	9,853
Manufacturing and development obligations-current	2,219	3,282
Debt-current	4,527	2,956
Deferred revenue-current	613	554
Total current liabilities	22,818	21,862
Non-current liabilities:
Debt-non-current	15,301	16,848
Deferred income taxes	131	122
Manufacturing and development obligations-non-current	4,840	4,542
Other non-current liabilities	1,314	1,263
Total liabilities	$ 44,404	$ 44,637
Commitments and contingencies
Stockholders' equity:
Common stock	$ 101	$ 99
Additional paid-in capital	694,741	685,189
Accumulated other comprehensive income	3,367	7,289
Accumulated deficit	(614,675)	(597,812)
Total stockholders' equity	83,534	94,765
Total liabilities and stockholders' equity	$ 127,938	$ 139,402