Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Jan. 01, 2020
Lessee, Lease, Description [Line Items]
Retained earnings (accumulated deficit)	$ 675,906	$ 629,040
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member
Cumulative Effect, Period of Adoption, Adjustment
Lessee, Lease, Description [Line Items]
Retained earnings (accumulated deficit)			$ (300)