Summary of Significant Accounting Policies (Narrative) (Details)		3 Months Ended	12 Months Ended
	Jan. 01, 2023 USD ($)	Mar. 31, 2023 USD ($) Portfolio Segment	Dec. 31, 2022 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of reporting segment | Segment		3
Allowance for doubtful accounts as of December 31, 2022			$ 122,000
Reserve for credit losses to notes receivable			200,000
Accumulated deficit		$ (242,672,000)	$ (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		400,000
Notes receivable, principal amount		29,100,000
Borrower's note balance		$ 22,400,000
Borrower's note balance, percentage		77.00%
Due from borrower		$ 22,400,000
Number of distinct portfolio purchases and loan agreements | Portfolio		20
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
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 to notes receivable		$ 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