Financing Receivables - Risk Ratings (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) contractor	Dec. 31, 2021 USD ($) contractor
Financing Receivable, Credit Quality Indicator [Line Items]
Amount outstanding	$ 91,158	$ 71,952
Advances
Financing Receivable, Credit Quality Indicator [Line Items]
Contractors | contractor	238	170
Amount outstanding	$ 86,590	$ 67,077
Average risk rating	2.1	2.0
Advances | Customer Concentration Risk | Financing Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
% of amount outstanding	100.00%	100.00%
Advances | Low risk
Financing Receivable, Credit Quality Indicator [Line Items]
Contractors | contractor	88	76
Amount outstanding	$ 12,363	$ 14,575
Advances | Low risk | Customer Concentration Risk | Financing Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
% of amount outstanding	14.30%	21.70%
Advances | Low-to-medium risk
Financing Receivable, Credit Quality Indicator [Line Items]
Contractors | contractor	97	77
Amount outstanding	$ 50,358	$ 38,955
Advances | Low-to-medium risk | Customer Concentration Risk | Financing Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
% of amount outstanding	58.20%	58.10%
Advances | Medium risk
Financing Receivable, Credit Quality Indicator [Line Items]
Contractors | contractor	52	17
Amount outstanding	$ 23,837	$ 13,547
Advances | Medium risk | Customer Concentration Risk | Financing Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
% of amount outstanding	27.50%	20.20%
Advances | Medium-to-high risk
Financing Receivable, Credit Quality Indicator [Line Items]
Contractors | contractor	1	0
Amount outstanding	$ 32	$ 0
Advances | Medium-to-high risk | Customer Concentration Risk | Financing Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
% of amount outstanding	0.00%	0.00%
Advances | Higher risk
Financing Receivable, Credit Quality Indicator [Line Items]
Contractors | contractor	0	0
Amount outstanding	$ 0	$ 0
Advances | Higher risk | Customer Concentration Risk | Financing Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
% of amount outstanding	0.00%	0.00%