Acquisition of Quellis (Details) $ in Thousands		9 Months Ended
	Jan. 28, 2021 USD ($) shares	Sep. 30, 2021 shares	Jun. 02, 2021
Common stock
Acquisition of Quellis
Issuance of common stock upon acquisition of Quellis (in shares)		555,444
Quellis Biosciences, Inc
Acquisition of Quellis
Cost to acquire the assets | $	$ 170,681
Acquisition costs | $	$ 1,800
Quellis Biosciences, Inc | Common stock
Acquisition of Quellis
Issuance of common stock upon acquisition of Quellis (in shares)	555,444
Series X redeemable convertible preferred stock
Acquisition of Quellis
Issuance of preferred stock upon acquisition of Quellis (in shares)		50,504
Number of shares of common stock into which each share of Series X Preferred Stock may be converted		166.67	166.67
Series X redeemable convertible preferred stock | Quellis Biosciences, Inc
Acquisition of Quellis
Issuance of preferred stock upon acquisition of Quellis (in shares)	50,504
Number of shares of common stock into which each share of Series X Preferred Stock may be converted	166.67	166.67