KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints Louis S. Citron, Stephanie S. Brecher and Sasha O. Keough, and each of
them, with full power to act without the others, his true and lawful
attorney-in-fact, with full power of substitution, to sign any and all
instruments, certificates and documents that may be necessary, desirable or
appropriate to be executed on behalf of himself as an individual pursuant to
section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange
Act"), and any and all regulations promulgated thereunder, and to file the same,
with all exhibits thereto, and any other documents in connection therewith, with
the Securities and Exchange Commission, and with any other entity when and if
such is mandated by the Exchange Act or by the Financial Industry Regulatory
Authority, granting unto said attorney-in-fact full power and authority to do
and perform each and every act and thing necessary, desirable or appropriate,
fully to all intents and purposes as he or she might or could do in person,
thereby ratifying and confirming all that said attorney-in-fact, or his
substitutes, may lawfully do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 18th day of
November, 2020.

/s/ Jeffrey R. Immelt