Redeemable Convertible Preferred Stock and Stockholders’ Equity/(Deficit):

Redeemable Convertible Preferred Stock—The Company's redeemable convertible preferred stock automatically converted into common stock at a rate of one-for-one on the closing of the Company's IPO on August 2, 2017. As such, no shares of redeemable convertible preferred stock were authorized, issued and outstanding as of December 31, 2017. As of December 31, 2016, the Company had outstanding redeemable convertible preferred stock as follows:



	As of December 31, 2016
	Shares Authorized	Shares Issued and Outstanding	Aggregate Liquidation Preference		Proceeds, Net of Issuance Costs

Series A-1	4,378,284	1,459,427	$	500	$	462
Series A-2	109,552	36,517	11		11
Series A-3	9,099,610	3,033,202	259		241
Series B	36,338,577	12,112,853	7,998		7,952
Series C	33,388,982	11,129,656	12,000		11,950
Series D	28,574,005	9,524,665	10,269		10,201
Series E	12,041,148	4,013,712	14,924		14,841
Series F	20,808,580	6,936,186	50,536		50,453
Series G	21,527,376	7,175,784	70,991		68,062
Total	166,266,114	55,422,002	$	167,488	$	164,173

The terms of all redeemable convertible preferred stock are summarized below:

Conversion—Each share of redeemable convertible preferred stock is convertible at the option of the holder into such number of common stock as is determined by dividing the original issue price by the conversion price in effect at the time of conversion. The original issue prices, adjusted for the reverse split, are as follows: $0.3426 for Series A-1 preferred, $0.2913 for Series A-2 preferred,

$0.0855 for Series A-3 preferred, $0.6603 for Series B preferred, $1.0782 for Series C preferred,

$1.0782 for Series D preferred, $3.7182 for Series E preferred, $7.2858 for Series F preferred, and

$9.8931 for Series G preferred. Under the terms of the Company’s Amended and Restated Certificate of Incorporation, redeemable convertible preferred stock shall be automatically converted into shares of common stock upon the occurrence of specific events, including a firm commitment underwritten public offering with aggregate net proceeds of not less than $50,000.

Liquidation Preference—In the event of a voluntary or involuntary liquidation, dissolution, or winding-up of the Company, the holders of redeemable convertible preferred stock will be entitled to receive, prior and in preference to any distribution of any of the assets of the Company to the holders of common stock, an amount per share equal to the greater of (1) the original issue price (as adjusted for stock splits, stock dividends, reclassifications, and the like) for each share of redeemable convertible preferred stock held by them, plus declared but unpaid dividends, and (2) the amount such holder would have received if, immediately prior to such event, such holder had converted such share of redeemable convertible preferred stock into common stock. After payment of all preferential amounts, the remaining assets shall be distributed ratably among all holders of common stock on a pro rata basis based on the number of shares of common stock outstanding held by each such holder.

Redemption—At any time after December 15, 2021, the holders of not less than 67% of outstanding redeemable convertible preferred stock may request the Company to redeem all the outstanding shares of redeemable convertible preferred stock by paying in cash a sum per share with respect to each share of redeemable convertible preferred stock equal to the greater of (1) the original issue price of each share of preferred stock plus all declared but unpaid dividends or (2) the fair market value of each share of redeemable convertible preferred stock as determined by an appraisal performed by an independent third party approved by holders of at least 67% of the then outstanding shares of redeemable convertible preferred stock and the Company.

Accretion represents the increase or decrease in the redemption value of the Company’s redeemable convertible preferred stock. The redemption value increased for all periods presented. The recognized accretion related to the increase in the redemption value of the redeemable convertible preferred stock was reclassed upon the successful completion of the IPO, which occurred during the period ended December 31, 2017.

The following table presents the accretion of the redeemable convertible preferred stock to its redemption value recorded within the consolidated statements of changes in redeemable convertible preferred stock and stockholders’ deficit during the periods presented:



	Year End December 31,
	2015			2016			2017

Series A-1	$	(2,674	)	$	(1,618	)	$	(4,904	)
Series A-2	(67		)	(40		)	(123		)
Series A-3	(5,650		)	(3,360		)	(10,192		)
Series B	(22,561		)	(13,416		)	(40,336		)
Series C	(20,390		)	(12,333		)	(37,062		)
Series D	(17,450		)	(10,555		)	(31,717		)
Series E	(7,353		)	(4,086		)	(12,884		)
Series F	(12,494		)	(6,025		)	(20,184		)
Series G	(13,585		)	(4,069		)	(18,513		)
Total	$	(102,224	)	$	(55,502	)	$	(175,915	)

Voting—The holder of each share of redeemable convertible preferred stock has the right to one vote for each full share of common stock into which its respective shares of redeemable convertible preferred stock would be convertible on the record date for the vote.

Dividends—The holders of redeemable convertible preferred stock are entitled to receive noncumulative dividends out of any funds legally available, prior and in preference to any declaration or payment of any dividends to holders of common stock. Dividends are payable when, as and if declared by the board of directors at a rate of $0.0273 per share for Series A-1 preferred, $0.0234 per share for Series A-2 preferred, $0.0069 per share for Series A-3 preferred, $0.0528 per share for Series B preferred, $0.0864 per share for Series C preferred and Series D preferred, $0.2976 per share for Series E preferred, $0.5829 per share for Series F preferred, and $0.7914 per share Series G preferred, per year (as adjusted for stock splits, stock dividends, reclassifications and the like). The holders of the redeemable convertible preferred stock also shall be entitled to participate pro rata in any dividends or other distributions paid on the common stock on an as-if-converted basis.

Common Stock—At December 31, 2016 and 2017, the Company was authorized to issue 290,081,638 and 500,000,000 shares of common stock with a par value of $0.001 per share, respectively.

The Company has reserved shares of common stock, on an as-converted basis, for future issuance as follows:



	December 31,
	2016	2017

Redeemable convertible preferred stock outstanding	55,422,002	—
Stock options issued and outstanding	13,291,684	13,180,950
Restricted stock units outstanding	—	981,276
Shares available for future equity grants	4,941,504	7,026,071
Total	73,655,190	21,188,297

Preferred Stock—As of December 31, 2017, the Company had authorized 10,000,000 shares of preferred stock, par value $0.001, of which no shares were outstanding.