Warrants	12 Months Ended
Dec. 31, 2017
Warrants [Abstract]
Warrants	Note 5. Warrants Common Stock Warrants In connection with entering into and amending the senior credit facility, see Note 12, the Company issued warrants to purchase an aggregate of 21,208 shares of Class B common stock at an exercise price of $14.31 per share. On September 26, 2016, one of the warrant holders exercised warrants to purchase 10,604 shares of Class B common stock. The remaining warrants to purchase 10,604 shares of Class B common stock were outstanding as of December 31, 2017. Convertible Preferred Stock Warrant The Company previously issued a warrant to purchase 27,321 shares of Series A convertible preferred stock in conjunction with a loan and security agreement with Silicon Valley Bank, or SVB, at an exercise price of $1.37255 per share. Immediately prior to the completion of the IPO, this warrant was converted to a warrant to purchase 27,321 shares of Class B common stock. On September 26, 2016, the warrant holder exercised the warrant and the Company issued 25,658 shares of Class B common stock through a cashless exercise of the warrant, in accordance with its terms.

Note 5. Warrants

Common Stock Warrants

In connection with entering into and amending the senior credit facility, see Note 12, the Company issued warrants to purchase an aggregate of 21,208 shares of Class B common stock at an exercise price of $14.31 per share. On September 26, 2016, one of the warrant holders exercised warrants to purchase 10,604 shares of Class B common stock. The remaining warrants to purchase 10,604 shares of Class B common stock were outstanding as of December 31, 2017.

Convertible Preferred Stock Warrant

The Company previously issued a warrant to purchase 27,321 shares of Series A convertible preferred stock in conjunction with a loan and security agreement with Silicon Valley Bank, or SVB, at an exercise price of $1.37255 per share. Immediately prior to the completion of the IPO, this warrant was converted to a warrant to purchase 27,321 shares of Class B common stock. On September 26, 2016, the warrant holder exercised the warrant and the Company issued 25,658 shares of Class B common stock through a cashless exercise of the warrant, in accordance with its terms.