Subsequent Events (Details) - USD ($)		3 Months Ended
	Jun. 30, 2020	Jul. 31, 2020	Jun. 01, 2020	Apr. 30, 2020	May 01, 2019
Subsequent Event [Line Items]
Operating lease right-of-use assets, net				$ 2,798,000	$ 3,201,000
Rockville, MD | Subsequent Event
Subsequent Event [Line Items]
Operating lease right-of-use assets, net		$ 118,000	$ 3,800,000
Operating lease, liability		125,000	$ 3,800,000
Operating lease, cost		$ 7,000
Rockville, MD New Location | Subsequent Event
Subsequent Event [Line Items]
Operating lease right-of-use assets, net	$ 850,000
Operating lease, liability	926,000
Gain (loss) on termination of lease	$ 76,000