CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accounts receivable, allowances
Accounts receivable, allowances (in dollars)	$ 1,460	$ 1,022
Common stock
Common stock, par value (in dollars per share)	$ 0.000005	$ 0.000005
Common stock, authorized shares	900,000,000	900,000,000
Common stock, issued shares	0	0
Common stock, outstanding shares	0	0
Preferred stock
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, Authorized shares	100,000,000	100,000,000
Preferred stock, issued shares	0	0
Preferred stock, outstanding shares	0	0
Class A Common
Common stock
Common stock, par value (in dollars per share)	$ 0.000005	$ 0.000005
Common stock, authorized shares	750,000,000	750,000,000
Common stock, issued shares	67,550,585	53,482,669
Common stock, outstanding shares	67,550,585	53,482,669
Class B Common
Common stock
Common stock, par value (in dollars per share)	$ 0.000005	$ 0.000005
Common stock, authorized shares	150,000,000	150,000,000
Common stock, issued shares	84,885,525	98,230,363
Common stock, outstanding shares	84,885,525	98,230,363