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Revenue
 3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue
The following tables present our revenues for the three months ended March 31, 2022 and 2021, disaggregated by major source (in thousands):
Three Months Ended March 31, 2022
HealthcareConstructionTotal
Major Goods/Service Lines
Mobile Imaging$10,518 $— $10,518 
Camera1,132 — 1,132 
Camera Support1,679 — 1,679 
Healthcare Revenue from Contracts with Customers13,329 — 13,329 
Lease Income89 — 89 
Construction— 11,631 11,631 
Total Revenues$13,418 $11,631 $25,049 
Timing of Revenue Recognition
Services and goods transferred over time$10,854 $1,897 $12,751 
Services and goods transferred at a point in time2,564 9,734 12,298 
Total Revenues$13,418 $11,631 $25,049 

Three Months Ended March 31, 2021
HealthcareConstructionTotal
Major Goods/Service Lines
Mobile Imaging$10,181 $— $10,181 
Camera1,422 — 1,422 
Camera Support1,646 — 1,646 
Healthcare Revenue from Contracts with Customers13,249 — 13,249 
Lease Income58 38 96 
Construction— 9,009 9,009 
Total Revenues$13,307 $9,047 $22,354 
Timing of Revenue Recognition
Services and goods transferred over time$11,092 $2,731 $13,823 
Services and goods transferred at a point in time2,215 6,316 8,531 
Total Revenues$13,307 $9,047 $22,354 
We have corrected an immaterial disclosure error in the previously disclosed disaggregated revenue balances relating to the timing of revenue for the three months ended March 31, 2021. For the three months ended March 31, 2021, the amount of $0.6 million was revised from over time to point in time related to revenue recognition in the table above. Healthcare for goods transferred over time decreased by $0.6 million, with a corresponding increase to revenue recognized for goods and services transferred at a point in time. The adjustments did not impact the total amount of revenue or the period in which it was recognized, therefore, they had no effect on the condensed Consolidated Balance Sheets, Statements of Operations and Cash Flows for the periods presented.
Nature of Goods and Services
Mobile Imaging
Within our Healthcare segment, our sales are derived from providing services and materials to our customers, primarily physician practices and hospitals that allow them to perform diagnostic services at their site. We typically bundle our services in providing staffing, our imaging systems, licensing, radiopharmaceuticals, and supplies depending on our customers’ needs. Our contracts with customers are typically entered into annually and are billed on a fixed rate per-day or per-scan basis, depending
on terms of the contract. For the majority of these contracts, we have the right to invoice the customer in an amount that directly corresponds with the value to the customer as we perform the services. We use the practical expedient to recognize revenue corresponding with amounts we have the right to invoice for services performed.
Camera
Within our Healthcare segment, camera revenues are generated from the sale of internally developed solid-state gamma camera imaging systems and accessories. We recognize revenue upon transfer of control to the customer at a point-in-time, which is generally upon delivery and acceptance. We also provide installation services and training on cameras we sell, primarily in the United States. Installation and initial training is generally performed shortly after delivery. We recognize revenues for installation and training over time as the customer receives and consumes benefits provided as we perform the installation services.
Our sale of imaging systems includes a one-year assurance-type warranty. The estimated costs associated with our standard warranties and field service actions continue to be recognized as expense when cameras are sold. Maintenance service contracts sold beyond the term of our standard warranties are accounted for as a service-type warranty and revenue is deferred and recognized ratably over the period of the warranty obligation.
Camera Support
Within our Healthcare segment, camera support revenue is derived from the sale of separately-priced extended maintenance contracts to camera owners, training, and the sale of parts to customers that do not have an extended warranty. Our separately priced service contracts range from 12 to 48 months. Service contracts are usually billed at the beginning of the contract period or at periodic intervals (e.g., monthly, quarterly, or annually) and revenue is recognized ratably over the term of the agreement.
Services and training revenues are recognized in the period the services and training are performed. Revenue for sales of parts are recognized when the parts are delivered to the customer and control is transferred.
Lease Income
Within our Healthcare segment, we also generate income from rentals of state-of-the-art equipment including cameras and ultrasound machines to customers. Rental contracts are structured as either a weekly or monthly payment arrangement and are accounted for as operating leases. Revenues are recognized on a straight-line basis over the term of the rental.
Construction
Within the Construction segment, we service residential and commercial construction projects by manufacturing modular housing units and other products and supply general contractors with building materials. KBS manufactures modular buildings for both single-family residential homes and larger, commercial building projects. EdgeBuilder manufactures structural wall panels, permanent wood foundation systems and other engineered wood products, and Glenbrook is a retail supplier of lumber and other building supplies. Revenues are evaluated on a contract by contract basis. In general, construction revenues are recognized upon transfer of control to the customer at a point-in-time, which is generally upon delivery and acceptance. However, construction revenues are recognized over time for arrangements with customers for which: (i) performance does not create an asset with an alternative use, and (ii) we have an enforceable right to payment for performance completed to date.
Deferred Revenue
Changes in the deferred revenue for three months ended March 31, 2022, is as follows (in thousands):
Balance at December 31, 2021$2,869 
Revenue recognized that was included in balance at beginning of the year(2,011)
Deferred revenue, net, related to contracts entered into during the year2,503 
Balance at March 31, 2022$3,361 
As of March 31, 2022 and December 31, 2021, non-current deferred revenue was $386 thousand and $412 thousand, respectively, in other liabilities within our condensed Consolidated Balance Sheets, which is expected to be recognized over a period of 2-4 years.
Billings in Excess of Costs and Estimated Profit
Changes in the billings in excess of costs and estimated profit for three months ended March 31, 2022 is as follows (in thousands):
Balance at December 31, 2021$312 
Revenue recognized that was included in balance at beginning of the year(312)
Billings in excess of costs, related to contracts entered into during the year15 
Balance at March 31, 2022$15 
As of March 31, 2022, billings in excess of costs and estimated profit was $15 thousand and $0.3 million balance as of December 31, 2021, respectively in current liabilities within our condensed Consolidated Balance Sheet. As of March 31, 2022, total contract assets was $55 thousand and no balance as of December 31, 2021, respectively in other current assets within our condensed Consolidated Balance Sheet.