Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 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, when outstanding, included the following:

	Three Months Ended September 30,		Nine Months Ended September 30,
	2016	2017	2016	2017
Valuation methodology:
Income approach (private company)	15.0%	N/A	15.0%	12.5%
Market approach (private company)	15.0%	N/A	15.0%	12.5%
PWERM (IPO)	52.5%	N/A	52.5%	60.0%
PWERM (M&A)	17.5%	N/A	17.5%	15.0%
IPO revenue multiple	3.25x-3.5x	N/A	3.0x-4.5x	2.8x-3.0x
Forecasted revenue growth rate	28.0%-40.0%	N/A	28.0%-40.9%	31.1%-40.0%
Discount rate	20.0%-25.0%	N/A	20.0%-25.0%	20.0%

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 September 30, 2017, related to our financial instruments, measured at fair value on a recurring basis, is set forth below:

		Fair Value
Financial Instrument	Fair Value Hierarchy	December 31,		September 30,
		2016		2017
Money market funds (included in cash and cash equivalents)	Level I	46,357		191,738
Certificates of deposit (included in short-term investments)	Level II	1,749		1,258
Interest rate lock commitments	Level II	—		6
Forward loan commitments	Level II	—		(2	)
Redeemable convertible preferred stock (mezzanine equity)	Level III	(655,416	)	—