Commitments and Contingencies (Lease liability maturity) (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Leases [Abstract]
2019	$ 3,048
2020	4,174
2021	4,294
2022	4,417
2023	4,544
Thereafter	13,590
Total future minimum lease payments	34,067
Less: discount	(5,494)
Total lease liability	$ 28,573