Commitments and Contingencies

12 Months Ended

Dec. 31, 2020

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

11.   Commitments and Contingencies

Operating Leases

The Company leases laboratory, office and vivarium space in Cambridge, MA which expires January 31, 2021. The Company executed a sublease for laboratory and office space in Boston, MA effective in December 2020 with rent beginning in January 2021. The lease expires May 19, 2025. Rental expense was $2.0 million and $1.8 million for the year ended December 31, 2020 and 2019, respectively.

The future minimum rental payments under the leases as of December 31, 2020 are as follows:

	Amount
Year Ending December 31,	(000's)
2021	$	1,440
2022		1,312
2023		1,345
2024		1,379
2025		589
	$	6,065

Additional commitments include a 2018 Credit Facility (Note 7) and collaboration agreements (Note 10).