REVENUE RECOGNITION - Schedule of Revenue Disaggregated by Major Source (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Total revenues	$ 47,959	$ 36,853	$ 115,366	$ 106,456
Transferred Over Time
Disaggregation of Revenue [Line Items]
Revenues	26,675		75,329
Transferred At Point In Time
Disaggregation of Revenue [Line Items]
Revenues	21,284		40,037
Revenue from RPO Customers
Disaggregation of Revenue [Line Items]
Revenues	17,933		51,103
Revenue from Contracting Customers
Disaggregation of Revenue [Line Items]
Revenues	19,105		53,342
Revenue from Other Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues	10,921		10,921
Building Solutions
Disaggregation of Revenue [Line Items]
Total revenues	9,603		9,603
Building Solutions | Transferred Over Time
Disaggregation of Revenue [Line Items]
Revenues	0		0
Building Solutions | Transferred At Point In Time
Disaggregation of Revenue [Line Items]
Revenues	9,603		9,603
Building Solutions | Revenue from RPO Customers
Disaggregation of Revenue [Line Items]
Revenues	0		0
Building Solutions | Revenue from Contracting Customers
Disaggregation of Revenue [Line Items]
Revenues	0		0
Building Solutions | Revenue from Other Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues	9,603		9,603
Business Services
Disaggregation of Revenue [Line Items]
Total revenues	37,038	36,853	104,445	106,456
Business Services | Transferred Over Time
Disaggregation of Revenue [Line Items]
Revenues	25,959	26,956	74,613	79,002
Business Services | Transferred At Point In Time
Disaggregation of Revenue [Line Items]
Revenues	11,079	9,897	29,832	27,454
Business Services | Revenue from RPO Customers
Disaggregation of Revenue [Line Items]
Revenues	17,933	17,569	51,103	51,177
Business Services | Revenue from Contracting Customers
Disaggregation of Revenue [Line Items]
Revenues	19,105	$ 19,284	53,342	$ 55,279
Business Services | Revenue from Other Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues	0		0
Energy Services
Disaggregation of Revenue [Line Items]
Total revenues	1,318		1,318
Energy Services | Transferred Over Time
Disaggregation of Revenue [Line Items]
Revenues	716		716
Energy Services | Transferred At Point In Time
Disaggregation of Revenue [Line Items]
Revenues	602		602
Energy Services | Revenue from RPO Customers
Disaggregation of Revenue [Line Items]
Revenues	0		0
Energy Services | Revenue from Contracting Customers
Disaggregation of Revenue [Line Items]
Revenues	0		0
Energy Services | Revenue from Other Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues	$ 1,318		$ 1,318