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Organization and Description of Business (Details)
 3 Months Ended 23 Months Ended
May 09, 2023
USD ($)
Apr. 01, 2023
USD ($)
Dec. 08, 2022
Mar. 31, 2024
USD ($)
solution
shares
Mar. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
May 10, 2023
shares
Dec. 03, 2022
USD ($)
Jan. 31, 2018
patient
Schedule of Capitalization, Equity [Line Items]                    
Payments to acquire minority interest       $ 0 $ 100,000          
Number of renal transplant patients (more than) | patient                   1,900
Accumulated deficit       695,450,000     $ 678,269,000      
Cash, cash equivalents, and short-term investments       $ 215,900,000            
Shares reserved for future issuance of common stock (in shares) | shares               250,000,000    
Stock repurchase program, authorized amount                 $ 50,000,000  
Stock repurchase program, period in force (in years)     2 years              
Number of common stock purchased (in shares) | shares       55,500            
Stock repurchased value       $ 500,000            
Stock repurchase program, remaining authorized repurchase amount       $ 21,400,000            
Miromatrix, Inc.                    
Schedule of Capitalization, Equity [Line Items]                    
Payments to acquire minority interest           $ 5,100,000        
XynManagement, Inc.                    
Schedule of Capitalization, Equity [Line Items]                    
Number of unique solutions | solution       2            
AlloSure Kidney                    
Schedule of Capitalization, Equity [Line Items]                    
Reimbursement rate       $ 2,841            
AlloMap Heart                    
Schedule of Capitalization, Equity [Line Items]                    
Reimbursement rate       3,240            
AlloSure Heart                    
Schedule of Capitalization, Equity [Line Items]                    
Reimbursement rate       $ 2,753            
AlloSure lung Testing Services                    
Schedule of Capitalization, Equity [Line Items]                    
Reimbursement rate $ 2,753                  
HeartCare                    
Schedule of Capitalization, Equity [Line Items]                    
Reimbursement rate   $ 5,993