Operating Leases - Narrative (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) Renew_Option	Dec. 31, 2018	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member	us-gaap:AccountingStandardsUpdate201602Member
Right-of-use lease assets	$ 7,329		$ 8,991	$ 9,600
Operating lease liabilities	$ 8,204		$ 9,990	10,600
Number of options to renew | Renew_Option	1
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Renewal term	1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Renewal term	5 years
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings				$ 53