Summary of significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2022

Summary of significant accounting policies

Schedule of money market funds and marketable securities

Cash, cash equivalents, and marketable securities as of December 31, 2022 and 2021 consist of the following:

	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
	(in thousands)
As of December 31, 2022
Money market funds included in cash and cash equivalents	$	91,724		—		—	$	91,724
Marketable securities- U.S. Treasury notes		19,980		—		(91)		19,889
Total money market funds and marketable securities	$	111,704	$	—	$	(91)	$	111,613
As of December 31, 2021
Money market funds included in cash and cash equivalents	$	100,305	$	—	$	—	$	100,305
Marketable securities- U.S. Treasury notes		15,117		—		(11)		15,106
Total money market funds and marketable securities	$	115,422	$	—	$	(11)	$	115,411

Reconciliation of cash, cash equivalents, and restricted cash

	As of December 31,
	2022		2021		2020
	(in thousands)
Cash and cash equivalents	$	98,959	$	117,433	$	104,440
Restricted cash included in deposits and other non-current assets		1,515		1,779		1,779
Total cash, cash equivalents, and restricted cash	$	100,474	$	119,212	$	106,219

Outstanding potentially dilutive securities excluded in the calculation of diluted net income (loss) per share

The following table sets forth the outstanding potentially dilutive securities that have been excluded in the calculation of diluted net (loss) income per share because to do so would be anti-dilutive:

	As of December 31,
	2022	2021	2020
Unvested restricted common stock awards	45,000	137,255	156,863
Unvested restricted common stock units	1,112,563	806,379	527,625
Outstanding stock options	6,199,571	5,013,193	5,379,856
Total	7,357,134	5,956,827	6,064,344

Schedule of weighted average number of shares, basic and diluted

	Year Ended December 31,
	2022		2021		2020
	(in thousands, except share data)
Numerator:
Net (loss) income	$	(46,408)	$	(71,197)	$	36,741
Denominator for basic net (loss) income per share:
Weighted average shares outstanding-basic		38,356,810		37,668,947		37,132,447
Denominator for diluted net (loss) income per share:
Weighted average shares outstanding		38,356,810		37,668,947		37,132,447
Common stock options and restricted stock units		—		—		216,068
Weighted average shares outstanding-diluted		38,356,810		37,668,947		37,348,514