Basis of Presentation and Summary of Significant Accounting Policies - Supplemental Balance Sheet Information Regarding Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Credit loss expense (reversal) for accounts and notes receivable	$ (1,200)	$ (700)
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201602Member
Accumulated deficit	(50,607)	$ (50,607)	$ 10,463
Accounts receivable, net	81,883	81,883	76,373
Other current assets	17,854	17,854	13,504
Other assets	16,600	16,600	17,516
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest receivable	$ 100	$ 100	$ 100
Impact of adopting Topic 326
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit					$ 816
Accounts receivable, net					(367)
Other current assets					(83)
Other assets					$ (366)