Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parenthetical)

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Accounts receivable, allowance $ 7,855 $ 5,352
Redeemable convertible preferred stock, shares issued (in shares) 480,000 480,000
Redeemable convertible preferred stock, shares outstanding (in shares) 480,000 480,000
Common stock, shares issued (in shares) 269,774,079 250,867,462
Common stock, shares outstanding (in shares) 269,774,079 250,867,462