CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts	$ (44,061)	$ (44,730)
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares, issued (in shares)	120,982,543	117,682,543
Common stock, shares, outstanding (in shares)	120,982,543	117,682,543
Series A Preferred Stock
Convertible preferred stock series, par value (in dollars per share)	$ 0.0001	$ 0.0001
Convertible preferred stock series, liquidation preference	$ 2,677	$ 2,603
Convertible preferred stock series, shares authorized (in shares)	825,000	825,000
Convertible preferred stock series, shares issued (in shares)	21,645	21,645
Convertible preferred stock series, shares outstanding (in shares)	21,645	21,645
Series C Preferred Stock
Convertible preferred stock series, par value (in dollars per share)	$ 0.0001	$ 0.0001
Convertible preferred stock series, liquidation preference	$ 77,632	$ 75,491
Convertible preferred stock series, shares authorized (in shares)	625,000	625,000
Convertible preferred stock series, shares issued (in shares)	614,177	614,177
Convertible preferred stock series, shares outstanding (in shares)	614,177	614,177

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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