Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts receivable, allowance	$ 0	$ 160
Common stock, par value	$ 0.00000625	$ 0.00000625
Common stock, shares authorized	2,020,517	2,020,517
Common stock, shares outstanding	814,166	779,250
Common Class A [Member]
Common stock, shares outstanding	658,068	589,100
Common Class B [Member]
Common stock, shares outstanding	135,581	169,633
Common Class C [Member]
Common stock, shares outstanding	20,517	20,517