Current Expected Credit Losses - Schedule of Net Investment in Leases and Financed Sale Receivables with Billed Amounts Past Due Continues to Accrue Finance Income (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	$ 17,181	$ 17,116
Unbilled	121,727	122,525
Allowance for Credit Losses	(8,072)	(7,831)
Total financing receivables	130,836	131,810
Net Investment in Leases [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	1,264	1,167
Unbilled	19,940	18,804
Allowance for Credit Losses	(581)	(557)	$ (464)	$ (155)
Total financing receivables	20,623	19,414
Net Financed Sales Receivables [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	15,917	15,949
Unbilled	101,787	103,721
Allowance for Credit Losses	(7,491)	(7,274)	$ (3,557)	$ (915)
Total financing receivables	110,213	112,396
Accrued and Current [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	1,652	3,605
Accrued and Current [Member] | Net Investment in Leases [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	157	298
Accrued and Current [Member] | Net Financed Sales Receivables [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	1,495	3,307
30 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	3,051	2,123
30 to 89 Days Past Due [Member] | Net Investment in Leases [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	122	180
30 to 89 Days Past Due [Member] | Net Financed Sales Receivables [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	2,929	1,943
Equal To Greater Than 90 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	12,478	11,388
Equal To Greater Than 90 Days Past Due [Member] | Net Investment in Leases [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	985	689
Equal To Greater Than 90 Days Past Due [Member] | Net Financed Sales Receivables [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	11,493	10,699
Net Investment in Leases and Financed Sale Receivables Continue to Accrue Finance Income [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	13,363	14,578
Unbilled	68,055	76,514
Allowance for Credit Losses	(2,679)	(4,744)
Total financing receivables	78,739	86,348
Net Investment in Leases and Financed Sale Receivables Continue to Accrue Finance Income [Member] | Net Investment in Leases [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	860	752
Unbilled	12,644	13,912
Allowance for Credit Losses	(90)	(310)
Total financing receivables	13,414	14,354
Net Investment in Leases and Financed Sale Receivables Continue to Accrue Finance Income [Member] | Net Financed Sales Receivables [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	12,503	13,826
Unbilled	55,411	62,602
Allowance for Credit Losses	(2,589)	(4,434)
Total financing receivables	65,325	71,994
Net Investment in Leases and Financed Sale Receivables Continue to Accrue Finance Income [Member] | Accrued and Current [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	1,124	2,257
Net Investment in Leases and Financed Sale Receivables Continue to Accrue Finance Income [Member] | Accrued and Current [Member] | Net Investment in Leases [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	141	231
Net Investment in Leases and Financed Sale Receivables Continue to Accrue Finance Income [Member] | Accrued and Current [Member] | Net Financed Sales Receivables [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	983	2,026
Net Investment in Leases and Financed Sale Receivables Continue to Accrue Finance Income [Member] | 30 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	2,223	1,713
Net Investment in Leases and Financed Sale Receivables Continue to Accrue Finance Income [Member] | 30 to 89 Days Past Due [Member] | Net Investment in Leases [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	96	162
Net Investment in Leases and Financed Sale Receivables Continue to Accrue Finance Income [Member] | 30 to 89 Days Past Due [Member] | Net Financed Sales Receivables [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	2,127	1,551
Net Investment in Leases and Financed Sale Receivables Continue to Accrue Finance Income [Member] | Equal To Greater Than 90 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	10,016	10,608
Net Investment in Leases and Financed Sale Receivables Continue to Accrue Finance Income [Member] | Equal To Greater Than 90 Days Past Due [Member] | Net Investment in Leases [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	623	359
Net Investment in Leases and Financed Sale Receivables Continue to Accrue Finance Income [Member] | Equal To Greater Than 90 Days Past Due [Member] | Net Financed Sales Receivables [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Billed	$ 9,393	$ 10,249