Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts receivable, allowance	$ 0	$ 0
Common stock, par value	$ 0.00000625	$ 0.00000625
Common stock, shares authorized	2,020,517	2,020,517
Common stock, shares outstanding	932,923	905,860
Common Class A [Member]
Common stock, shares outstanding	798,658	770,658
Common Class B [Member]
Common stock, shares outstanding	113,748	114,685
Common Class C [Member]
Common stock, shares outstanding	20,517	20,517