CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 58,605	$ 39,554
Available-for-sale securities	155,981	107,282
Accounts receivable, net	2,778
Inventories	25,353	3,107
Prepaid expenses and other assets	19,446	1,793
Total current assets	262,163	151,736
Property and equipment, net	1,951	320
Total assets	264,114	152,056
Current liabilities:
Accounts payable	25,375	2,940
Accrued and other liabilities	13,777	6,392
Deferred revenue	1,150
Current liabilities of discontinued operations	903	1,640
Total current liabilities	41,205	10,972
Commitments and contingencies
Stockholders' equity:
Preferred stock; $1.00 par value; 5,000 shares authorized; no shares issued and outstanding at December 31, 2012 and 2011
Common stock; $.001 par value; 200,000 shares authorized at December 31, 2012 and 2011; 100,659 and 88,975 shares issued and outstanding at December 31, 2012 and 2011, respectively	101	89
Additional paid-in capital	708,921	487,235
Accumulated other comprehensive income	33	25
Accumulated deficit	(486,146)	(346,265)
Total stockholders' equity	222,909	141,084
Total liabilities and stockholders' equity	$ 264,114	$ 152,056