CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 7,704	$ 71,018
Short-term investments	76,350	25,698
Investment in marketable equity securities	4,487	11,163
Accounts receivable	5,149	5,794
Inventories	12,111	10,812
Prepaid expenses	1,066	1,166
Other current assets	5,345	4,755
Total current assets	112,212	130,406
Non-current assets:
Property and equipment, net	3,216	3,549
Goodwill	1,316	1,316
Intangible assets, net	839	940
Restricted cash	575	612
Other assets	2,293	2,579
Total assets	120,451	139,402
Current liabilities:
Accounts payable	7,190	5,217
Accrued liabilities	9,439	9,853
Manufacturing and development obligations - current	2,221	3,282
Debt - current	6,127	2,956
Deferred revenue - current	767	554
Total current liabilities	25,744	21,862
Non-current liabilities:
Debt - non-current	13,726	16,848
Deferred income taxes	140	122
Manufacturing and development obligations - non-current	4,844	4,542
Other non-current liabilities	1,356	1,263
Total liabilities	45,810	44,637
Commitments and contingencies
Stockholders' equity:
Common stock	102	99
Additional paid-in capital	704,402	685,189
Accumulated other comprehensive income	2,978	7,289
Accumulated deficit	(632,841)	(597,812)
Total stockholders' equity	74,641	94,765
Total liabilities and stockholders' equity	$ 120,451	$ 139,402