CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 124,713	$ 58,605
Available-for-sale securities	233,542	155,981
Accounts receivable, net	5,085	2,778
Inventories	34,217	25,353
Prepaid expenses and other assets	18,338	19,159
Total current assets	415,895	261,876
Property and equipment, net	3,329	1,951
Non-current assets	7,788	287
Total assets	427,012	264,114
Current liabilities:
Accounts payable	16,777	25,375
Accrued and other liabilities	16,047	14,680
Deferred revenue	2,846	1,150
Total current liabilities	35,670	41,205
Long term debt	206,220
Total liabilities	241,890	41,205
Commitments and contingencies
Stockholders' equity:
Preferred stock; $1.00 par value; 5,000 shares authorized; no shares issued and outstanding
Common stock; $.001 par value; 200,000 shares authorized; 100,853 and 100,659 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively	101	101
Additional paid-in capital	780,281	708,921
Accumulated other comprehensive (loss) income	(26)	33
Accumulated deficit	(595,234)	(486,146)
Total stockholders' equity	185,122	222,909
Total liabilities and stockholders' equity	$ 427,012	$ 264,114