Redeemable Convertible Preferred Stock and Stockholders’ Deficit (Tables)

9 Months Ended

Sep. 30, 2018

Stockholders Equity Note [Abstract]

Summary of Authorized, Issued, and Outstanding Shares of Preferred Stock and Carrying Amounts and Liquidation Values

As of September 30, 2018, the authorized, issued, and outstanding shares of Preferred Stock and their carrying amounts and liquidation values were as follows:

			Shares Issued
	Shares		and		Carrying		Liquidation
	Authorized		Outstanding		Amount		Value
Series 1		132,255		132,255	$	523,838	$	526,778
Series 2		1		1		243,640		250,000
Series AA		575,470		573,961		7,617,120		7,619,998
Series B		6,382,259		6,251,502		60,371,358		60,379,282
Series C-1		4,524,375		2,319,228		22,140,786		22,401,423
Series C-2		916,095		—		—		—
Series C-3		790,895		—		—		—
Series D		4,971,346		3,923,168		34,712,552		37,893,880
Total		18,292,696	$	13,200,115	$	125,609,295	$	129,071,361

As of December 31, 2017, the authorized, issued, and outstanding shares of Preferred Stock and their carrying amounts and liquidation values were as follows:

			Shares Issued
	Shares		and		Carrying		Liquidation
	Authorized		Outstanding		Amount		Value
Series 1		132,255		132,255	$	522,266	$	526,778
Series 2		1		1		240,242		250,000
Series AA		575,470		573,961		7,615,583		7,619,998
Series B		6,382,259		6,251,502		60,366,480		60,379,282
Series C-1		4,524,375		2,174,280		20,888,972		20,999,997
Series C-2		916,095		—		—		—
Series C-3		790,895		—		—		—
Series D		—		—		—		—
Total		13,321,350		9,131,999	$	89,633,543	$	89,776,055

Summary of Common Stock Reserved for Future Issuance

Common Stock Reserved for Future Issuance

	Number of Shares as of
	September 30, 2018		December 31, 2017
Conversion of redeemable convertible preferred stock		13,200,115		9,131,999
Redeemable convertible preferred stock warrants		708,484		486,356
Stock options issued and outstanding		1,315,625		1,075,209
Authorized for future options		37,830		45,062
		15,262,054		10,738,626