Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' (Deficit) Equity (Parenthetical) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($)
Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' (Deficit) Equity
Issuance of common stock in initial public offering, offering costs	$ 8,173

Aggregate value of stock issued during the period net of offering costs.

No definition available.

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