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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 2,336 $ 1,063
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, authorized (in shares) 1,000,000 1,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, authorized (in shares) 224,000,000 224,000,000
Common stock, issued (in shares) 151,009,700 145,538,063
Common stock, outstanding (in shares) 151,009,700 145,538,063