Convertible Preferred Stock and Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Temporary Equity Disclosure [Abstract]

Summary of Changes in Convertible Preferred Stock and Stockholders' Equity (Deficit)

The following table provides a rollforward of the changes in convertible preferred stock and stockholders’ equity (deficit) for the nine months ended September 30, 2018:

	Convertible Preferred Stock $0.0001 Par Value						Common Stock $0.0001 Par Value				Additional Paid-in		Accumulated Other Comprehensive			Accumulated			Total Stockholders’ Equity
	Shares			Amount			Shares		Amount		Capital		Loss			Deficit			(Deficit)
Balance, January 1, 2018		127,199,705		$	137,762,160			2,637,011	$	264	$	799,859	$	(73,308	)	$	(40,180,866	)	$	(39,454,051	)
Conversion of convertible preferred stock    into common stock upon initial    public offering		(127,199,705	)		(137,762,160	)		24,168,656		2,417		137,759,743		—			—			137,762,160
Issuance of common stock in initial    public offering, net of discounts    and issuance costs		—			—			10,350,000		1,035		150,842,180		—			—			150,843,215
Vesting of common stock from    option exercise		—			—			97,250		11		56,975		—			—			56,986
Issuance of common stock    from option exercise		—			—			57,146		6		45,200		—			—			45,206
Stock-based compensation		—			—			—		—		1,667,790		—			—			1,667,790
Comprehensive gain		—			—			—		—		—		52,430			—			52,430
Net loss		—			—			—		—		—		—			(38,213,561	)		(38,213,561	)
Balance, September 30, 2018		—		$	—			37,310,063	$	3,733	$	291,171,747	$	(20,878	)	$	(78,394,427	)	$	212,760,175