Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Unobservable Inputs

Significant unobservable inputs used in the determination of fair value of the Company’s redeemable convertible preferred stock for the years ended December 31, 2015 and 2016 included the following:

	Year Ended  December 31,
	2015	2016
Valuation Methodology:
Income approach (private company)	12.5%	12.5%-15.0%
Market approach (private company)	12.5%	12.5%-15.0%
PWERM (IPO)	56.3%	52.5%-60.0%
PWERM (M&A)	18.8%	15.0%-17.5%
IPO revenue multiple	4.0x-5.0x	3.0x-4.5x
Forecasted revenue growth rate	30.0%-50.3%	28.0%-41.80%
Discount rate	20.0%-30.0%	20.0%-30.0%

Schedule of Assets, Liabilities, and Equity Measured at Fair Value on a Recurring Basis

A summary of assets, (liabilities), and (mezzanine equity) at December 31, 2016 and 2017, related to our financial instruments, measured at fair value on a recurring basis, is set forth below:

Financial Instrument	Fair Value Hierarchy	Fair Value
		December 31,
		2016		2017
Money market funds (included in cash and cash equivalents)	Level I	46,357		177,235
Certificates of deposit (included in short-term investments)	Level II	1,749		—
Interest rate lock commitments	Level II	—		29
Forward loan commitments	Level II	—		(4	)
Redeemable convertible preferred stock (mezzanine equity)	Level III	(655,416	)	—