Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Summary of Significant Accounting Policies

Schedule of potential common shares, presented based on amounts outstanding at each period end, excluded from computation of diluted net loss per share attributable to common stockholders

	September 30,
	2018		2017
Stock options		2,474,790		1,821,579
Series A convertible preferred shares		—		8,827,698
Total		2,474,790		10,649,277

Schedule of basic and diluted earnings per share

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Numerator:
Net loss	$	(17,686)	$	(10,016)	$	(48,557)	$	(23,178)
Cumulative dividends on convertible preferred shares		—		(1,413)		—		(3,785)
Loss attributable to common shares—basic and diluted	$	(17,686)	$	(11,429)	$	(48,557)	$	(26,963)
Denominator:
Weighted-average number of common shares—basic and diluted		34,256,519		6,404,254		29,859,314		8,918,389
Loss per common share—basic and diluted	$	(0.52)	$	(1.78)	$	(1.63)	$	(3.02)