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Common Stock Warrants	9 Months Ended
Common Stock Warrants	Sep. 30, 2019
Equity [Abstract]
Common Stock Warrants	Common Stock Warrants During 2018, all of the preferred and common stock warrants we issued in connection with loan agreements and a dispute settlement converted to warrants to purchase shares of Class B common stock. As of September 30, 2019, we had Class B common stock warrants outstanding to purchase 481,181 and 12,940 shares of Class B common stock at exercise prices of $27.78 and $38.64, respectively. As of December 31, 2018, we had Class B common stock warrants outstanding to purchase 481,182 and 312,939 shares of Class B common stock at exercise prices of $27.78 and $38.64, respectively.