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 September 30, 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	$	500,000	$	462,000
Series A-2	109,552	36,517	11,000		11,000
Series A-3	9,099,610	3,033,202	259,000		241,000
Series B	36,338,577	12,112,853	7,998,000		7,952,000
Series C	33,388,982	11,129,656	12,000,000		11,950,000
Series D	28,574,005	9,524,665	10,269,000		10,201,000
Series E	12,041,148	4,013,712	14,924,000		14,841,000
Series F	20,808,580	6,936,186	50,536,000		50,453,000
Series G	21,527,376	7,175,784	70,991,000		68,062,000
Total	166,266,114	55,422,002	$	167,488,000	$	164,173,000

Please see Note 6 to the Company's consolidated financial statements in the Prospectus for a description of the terms of the redeemable convertible preferred stock.

Accretion Income/(Expense)—Accretion represents the (increase) or decrease in the redemption value of the Company’s redeemable convertible preferred stock. For the nine months ended September 30, 2016, the fair value of the redeemable convertible preferred stock declined, resulting in accretion income. The recognized accretion related to the increase or decrease 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 September 30, 2017.

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



	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2017			2016		2017

Series A-1	$	(88	)	$	(1,119	)	$	1,448	$	(4,904	)
Series A-2	(2		)	(28		)	36		(123		)
Series A-3	(182		)	(2,349		)	3,010		(10,192		)
Series B	(1,090		)	(9,284		)	12,021		(40,336		)
Series C	(668		)	(8,530		)	11,039		(37,062		)
Series D	(571		)	(7,300		)	9,447		(31,717		)
Series E	(241		)	(2,948		)	4,102		(12,884		)
Series F	(208		)	(4,541		)	7,084		(20,184		)
Series G	—			(4,125		)	8,632		(18,513		)
Total	$	(3,050	)	$	(40,224	)	$	56,819	$	(175,915	)

Common Stock—At December 31, 2016 and September 30, 2017, the Company was authorized to issue 290,081,638 and 500,000,000 shares, respectively, of common stock with a par value of $0.001 per share.

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



	December 31,	September 30,
	2016	2017
Redeemable convertible preferred stock outstanding	55,422,002	—
Stock options issued and outstanding	13,291,684	13,298,339
Shares available for future equity grants	4,941,504	7,974,192
Total	73,655,190	21,272,531

Preferred Stock—As of September 30, 2017, the Company had authorized 10,000,000 shares of preferred stock, par value $0.001, of which no shares were outstanding.