Net loss per share (Tables)

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Schedule of Common Stock Equivalents Excluded from the Calculation of Diluted Net Loss per Share

The following common stock equivalents were excluded from the calculation of diluted net loss per share for the periods indicated because including them would have had an anti-dilutive effect (in thousands):

	Year ended December 31,
	2023	2022	2021
Outstanding stock options (1)	3,678	2,562	1,490
Restricted stock units (1)	2,239	1,314	1,080
Employee Stock Purchase Plan	81	35	—
	5,998	3,911	2,570

(1)Outstanding stock options and restricted stock units include awards outstanding to employees of bluebird bio.