Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Accounts receivable, allowance	$ 163	$ 163
Common stock, par value	$ 0.00000625	$ 0.00000625
Common stock, shares authorized	2,020,517,000	2,020,517,000
Common stock, shares outstanding	732,178,000	721,592,000
Class A [Member]
Common stock, shares outstanding	158,317,000	121,381,000
Class B [Member]
Common stock, shares outstanding	553,344,000	579,694,000
Class C [Member]
Common stock, shares outstanding	20,517,000	20,517,000