Commitments and Contingencies (Details) $ in Thousands		3 Months Ended		5 Months Ended
	Jan. 15, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Feb. 28, 2019 agreement	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Sublease income		$ 87	$ 71
Number of non-cancelable operating lease | agreement				2
Right-of-use assets		2,866			$ 3,331
Operating lease liability		$ 3,520
Operating lease discount rate		7.00%
Noncancelable operating leases term		3 years 5 months 23 days
Operating lease expense		$ 231	67
Cash paid for amount included in lease liabilities		500	$ 200
Waltham Massachusetts
Lessee, Lease, Description [Line Items]
Sublease income	$ 600	$ 200
Minimum
Lessee, Lease, Description [Line Items]
Operating lease term		6 months
Operating lease renewal term		5 years
Maximum
Lessee, Lease, Description [Line Items]
Operating lease term		4 years
Operating lease renewal term		10 years