Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Valuation Allowance [Line Items]
Threshold past due account balances for reserve analysis	$ 20,000
Threshold Past Due Days For Reserve Analysis	60
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of quarter	$ 5,472,000	$ 6,182,000
Bad debt expense	2,257,000	456,000
Write-offs, net of recoveries	(876,000)	(993,000)
Balance at end of quarter	$ 6,853,000	$ 5,645,000