CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 103,262	$ 58,605
Available-for-sale securities	240,024	155,981
Accounts receivable, net	12,214	2,778
Inventories, net	48,503	25,353
Prepaid expenses and other assets	19,938	19,159
Total current assets	423,941	261,876
Property and equipment, net	1,954	1,951
Non-current assets	5,901	287
Total assets	431,796	264,114
Current liabilities:
Accounts payable	10,759	25,375
Accrued and other liabilities	23,993	14,680
Deferred revenue	17,255	1,150
Total current liabilities	52,007	41,205
Long-term debt	213,106
Deferred revenue - net of current portion	10,360
Non-current accrued and other liabilities	2,954
Total liabilities	278,427	41,205
Commitments and contingencies
Stockholders' equity:
Preferred stock; $1.00 par value; 5,000 shares authorized; no shares issued and outstanding at December 31, 2013 and 2012
Common stock; $.001 par value; 200,000 shares authorized at December 31, 2013 and 2012; 103,161 and 100,659 shares issued and outstanding at December 31, 2013 and 2012, respectively	103	101
Additional paid-in capital	813,802	708,921
Accumulated other comprehensive income	66	33
Accumulated deficit	(660,602)	(486,146)
Total stockholders' equity	153,369	222,909
Total liabilities and stockholders' equity	$ 431,796	$ 264,114