Summary of Significant Accounting Policies (Narrative) (Details)			9 Months Ended	12 Months Ended
	Jun. 30, 2023	Jan. 01, 2023 USD ($)	Sep. 30, 2023 USD ($) Portfolio Segment	Dec. 31, 2022 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Allowance for doubtful accounts as of December 31, 2022				$ 122,000
Reserve for credit losses			$ 700,000	100,000
Accumulated deficit			(237,916,000)	$ (245,270,000)
Cumulative effect of the implementation of ASC 326			(119,000)
Reserve balance for credit loss		$ (119,000)
Percentage of service revenue that is recognized over a period of time against total revenue				1.3205%
Deferred revenue			600,000	$ 400,000
Notes receivable, principal amount			37,600,000
Borrower's note balance			$ 21,800,000
Borrower's note balance, percentage	73.00%		58.00%
Due from borrower			$ 21,800,000
Number of distinct portfolio purchases and loan agreements | Portfolio			31
Increase in reserve for credit losses			$ 900,000
Reserve for credit losses			$ 1,400,000
Increase in reserve for credit losses, percentage			3.80%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Adjustment To Retained Earnings		400,000
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Adjustment To Retained Earnings		300,000
Consolidated [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of reporting segment | Segment			3
ASC 326 [Member]
Summary Of Significant Accounting Policies [Line Items]
Allowance for doubtful accounts as of December 31, 2022				100,000
Reserve for credit losses			$ 300,000	200,000
Accumulated deficit		200,000	10,000,000
Adjustment To Retained Earnings		200,000
Cumulative effect of the implementation of ASC 326			$ 100,000
Reserve balance for credit loss		(100,000)		$ (10,000)
Increase in reserve for credit losses		$ 200,000