Commitments and Contingencies (Narrative) (Details)			1 Months Ended
	Apr. 05, 2019 USD ($)	Jun. 10, 2013 complaint	May 31, 2013 complaint	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Commitments and Contingencies [Line Items]
Loss contingency, number of complaints filled | complaint		12	12
Contingent liability				$ 3,352,000	$ 10,095,000	$ 24,976,000
Contingent liability for accrued earn-out acquisition consideration				0	1,474,000
Contingent liability, current				3,352,000	8,621,000
Contingent Accrued Earn-out Acquisition Consideration
Commitments and Contingencies [Line Items]
Contingent liability				3,400,000	10,100,000
Business combination, contingent long term liability				0	1,500,000
Contingent liability for accrued earn-out acquisition consideration				$ 3,400,000	$ 8,600,000
Settled Litigation
Commitments and Contingencies [Line Items]
Loss contingency, legal expenses sought to be paid	$ 19,650,000