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Segment Reporting
 3 Months Ended
Mar. 31, 2025
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting
Operating segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision maker (CODM) in making decisions regarding resource allocation and assessing performance. The Company views its operations as, and manages its business in, one operating segment focused on the design, development and commercialization of testing products which allow for the differential diagnosis, prognosis and monitoring of complex rheumatic, autoimmune and autoimmune-related disease. Segment revenue is primarily derived from the sale of the Company’s testing products, most of which is attributable to its AVISE® CTD test.
The Company’s CODM is its Chief Executive Officer. The CODM assesses performance for the segment and decides how to allocate resources based on revenue and net loss as reported on the condensed statements of operations, after taking into account the Company’s strategic priorities, its cash balance and its expected use of cash. The CODM considers budget/forecast versus actual results on a quarterly basis when making decisions about the allocation of resources. The measure of segment assets is reported on the balance sheet as total assets and were $40.3 million and $44.7 million as of March 31, 2025 and December 31, 2024, respectively.
Segment revenue and net loss, including significant segment expenses regularly provided to the CODM are as follows (in thousands):
 Three Months Ended March 31,
 20252024
Revenue$15,498 $14,415 
Cost of revenue6,375 5,817 
Gross margin9,123 8,598 
Segment operating expenses:
Employee expense7,548 6,693 
Outside services1,117 1,131 
Facilities related900 992 
Travel & entertainment736 533 
Stock compensation362 536 
Depreciation and amortization258 270 
Other1
1,567 1,446 
Total segment operating expenses12,488 11,601 
Loss from operations(3,365)(3,003)
Interest expense(545)(549)
Interest income158 192 
Segment net loss$(3,752)$(3,360)
1Other segment items included in Segment net loss include insurance expenses, trade show and conference expenses, fulfillment expenses, board compensation, clinical trial expenses, collaboration expenses and bank fees, among others.