Commitments and Contingencies (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2018 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2015
Leased assets
Rent for facility lease		$ 1,400	$ 1,000
Lease Cost:
Operating lease cost		1,375
Variable lease cost		674
Total lease cost		2,049
Operating cash flows used for operating leases		$ 1,266
Weighted average remaining lease term		3 years 9 months
Weighted average incremental borrowing rate		6.47%
Memorial Drive, Cambridge MA
Leased assets
Term of lease				5 years
Option to extend the term	true
Number of renewal options | item	1
Renewal term	5 years
Memorial Drive, Cambridge MA | Minimum
Leased assets
Rent for facility lease	$ 1,400
Memorial Drive, Cambridge MA | Maximum
Leased assets
Rent for facility lease	$ 1,700