Net loss per share (Tables)

12 Months Ended

Dec. 31, 2019

Net loss per share

Schedule of basic and diluted net loss per share attributable to common stockholders

	Year Ended December 31,
	2019		2018
Numerator:
Net loss	$	(43,755)	$	(81,714)
Accretion of redeemable convertible preferred stock to redemption value		—		(520)
Net loss attributable to common stockholders, basic and diluted	$	(43,755)	$	(82,234)
Denominator:
Weighted average common shares outstanding, basic and diluted		15,070,728		103,403
Net loss per share attributable to common stockholders, basic and diluted	$	(2.90)	$	(795.28)

Schedule of computation of diluted net loss per share attributable to common stockholders

	Year Ended December 31,
	2019	2018
Options to purchase common stock	3,096,555	1,839,913
Unvested restricted common stock	155,149	80,190
Redeemable convertible preferred stock (as converted to common stock)	—	21,056,136
	3,251,704	22,976,239