Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts receivable, allowance	$ 4,851	$ 5,270
Accumulated amortization	$ 6,802	$ 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)	912,065,931	904,448,226
Common stock, shares outstanding (shares)	912,065,931	904,448,226
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