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Segment Reporting
 12 Months Ended
Dec. 31, 2024
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 CODM in making decisions regarding resource allocation and assessing performance. The Company operates in a single 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 Statement 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 $44.7 million and $56.9 million for the years ended December 31, 2024 and 2023, respectively.
Segment revenue and net loss, including significant segment expenses regularly provided to the CODM are as follows (in thousands):
 Year Ended December 31,
 20242023
 
Revenue$55,641 $52,548 
Costs of revenue22,529 23,092 
Gross margin33,112 29,456 
Segment operating expenses:
Employee expense27,753 27,070 
Outside services4,253 5,920 
Facilities related3,674 5,125 
Travel & entertainment2,440 2,469 
Stock compensation1,604 3,426 
Depreciation and amortization1,041 1,426 
Other1
5,983 6,857 
Total segment operating expenses46,748 52,293 
Loss from operations(13,636)(22,837)
Interest expense(2,234)(2,335)
Interest income767 1,516 
Loss before income taxes(15,103)(23,656)
Income tax expense(12)(33)
Segment net loss$(15,115)$(23,689)
1 Other 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.