Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Oct. 30, 2022	Dec. 31, 2019	Oct. 30, 2019	Dec. 29, 2016
Lessee, Lease, Description [Line Items]
Term of lease contract						10 years
Renewal term of lease contract						5 years
Cash collateral as security	$ 909			$ 909
Lease expense	700	$ 700
Right of use asset amortization	$ 300	$ 300
Standby Letters of Credit
Lessee, Lease, Description [Line Items]
Security deposit					$ 600	$ 900
Forecast | Standby Letters of Credit
Lessee, Lease, Description [Line Items]
Security deposit			$ 300