Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts receivable, allowance	$ 5,681	$ 4,788
Accumulated amortization	$ 6,631	$ 6,315
Preferred stock, par value (USD per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (shares)	100,000,000	100,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Series A Preferred Stock
Preferred stock, par value (USD per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (shares)	1	1
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common Stock
Common stock, par value (USD per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (shares)	1,200,000,000	1,200,000,000
Common stock, shares issued (shares)	903,655,140	864,378,563
Common stock, shares outstanding (shares)	903,655,140	864,378,563
Nonvoting Common Stock
Common stock, par value (USD per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (shares)	400,000,000	400,000,000
Common stock, shares issued (shares)	134,008,656	134,008,656
Common stock, shares outstanding (shares)	134,008,656	134,008,656