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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Summary of changes in the fair value of preferred stock warrants

The changes in the fair value of preferred stock warrants are summarized below (in thousands):

		Year Ended December 31,
		2015				2016
Beginning balance		$	966			$	6,927
Change in value of preferred stock warrants recorded in other    expense, net			5,961				9,458
Reclassification to convertible preferred stock upon net    exercise of Series Seed warrant in February 2016			—				(3,789	)
Conversion of preferred stock warrants to common stock    warrants upon the closing of the Company’s IPO on    September 26, 2016			—				(12,596	)
Ending balance		$	6,927			$	—

Schedule of assumptions utilized to determine the fair value of preferred stock warrants

The Company determined the fair value of the preferred stock warrants utilizing the Black-Scholes model with the following assumptions:

		Series Seed								Series A-3
		As of								As of
		Dec 31, 2015				Sept 26, 2016				Dec 31, 2015				Sept 26, 2016
Contractual term (years)			5.7				4.9				7.2				6.5
Expected volatility			60.3	%			59.1	%			61.3	%			59.1	%
Risk-free interest rate			1.84	%			1.12	%			2.09	%			1.34	%
Estimated dividend yield			—	%			—	%			—	%			—	%

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- Definition

Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- References

No definition available.

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- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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