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Condensed Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Allowances for accounts receivable    
Allowances for accounts receivable $ 7,582 $ 3,486
Convertible preferred stock    
Convertible preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Convertible preferred stock, shares authorized (in shares) 314,930,070 314,930,070
Convertible preferred stock, shares issued (in shares) 65,428,088 65,428,088
Convertible preferred stock, shares outstanding (in shares) 65,428,088 65,428,088
Convertible preferred stock, aggregate liquidation preference $ 106,369 $ 106,369
Common stock    
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 443,500,000 441,000,000
Common stock, shares issued (in shares) 10,046,705 5,155,407
Common stock, shares outstanding (in shares) 10,046,705 5,155,407
Treasury stock    
Treasury stock, shares outstanding (in shares) 615,980 589,320