Equity (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Summary of Future Issuance of Common Stock Shares

The Company has reserved for future issuance the following number of shares of common stock (in thousands):

	As of December 31,
	2021	2020
Options to purchase common stock (1)	5,534	6,262
Restricted stock units (1)	3,427	1,495
2013 Stock Option and Incentive Plan	2,250	2,545
Pre-funded warrants	2,273	—
2013 Employee Stock Purchase Plan	1,347	67
	14,831	10,369

(1) Stock options and restricted stock units that are reserved for future issuance include awards outstanding to employees of 2seventy bio.