Current Expected Credit Losses - Schedule of Financing Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Net investment in leases
Gross minimum payments due under sales-type leases	$ 22,009	$ 20,830
Unearned finance income	(805)	(859)
Present value of minimum payments due under sales-type leases	21,204	19,971
Allowance for credit losses	(581)	(557)
Net investment in leases	20,623	19,414
Financed sales receivables
Gross minimum payments due under financed sales	149,714	150,917
Unearned finance income	(32,010)	(31,247)
Present value of minimum payments due under financed sales	117,704	119,670
Allowance for credit losses	(7,491)	(7,274)
Net financed sales receivables	110,213	112,396
Total financing receivables	130,836	131,810
Net financed sales receivables due within one year	32,591	34,937
Net financed sales receivables due after one year	77,622	77,459
Net financed sales receivables	$ 110,213	$ 112,396