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Organization and Description of Business - Additional Information (Detail) |  |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 11, 2021 USD ($) shares | Jan. 25, 2021 USD ($) $ / shares shares | Jun. 15, 2020 USD ($) $ / shares shares | Apr. 30, 2020 USD ($) | Mar. 31, 2021 USD ($) uniqueSolution center phlebotomist patient | Dec. 31, 2020 USD ($) | Jan. 31, 2018 patient
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Number of renal transplant patients (more than) | patient |  |  |  |  |  |  | 1,700
Number of transplant centers offering RemoTraC (more than) | center |  |  |  |  | 200 |  |
Number of patients enrolled in RemoTraC (more than) | patient |  |  |  |  | 7,000 |  |
Number of mobile phlebotomists (more than) | phlebotomist |  |  |  |  | 10,000 |  |
Accumulated deficit |  |  |  |  | $ 353,214,000 | $ 352,527,000 |
Cash, cash equivalents, and short-term investments |  |  |  |  | 374,300,000 |  |
Accelerated and advanced payment |  |  |  | $ 20,500,000 |  |  |
Grants receivable |  |  |  |  | $ 30,000,000,000.0 |  |
Medicare fee-for-service reimbursements proceeds, initial tranche |  |  |  | $ 4,800,000 |  |  |
Public Offering |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Shares issued and sold (in shares) | shares |  | 1,923,077 | 4,492,187 |  |  |  |
Sale of stock (in usd per share) | $ / shares |  | $ 91.00 | $ 32.00 |  |  |  |
Sale of stock, consideration received on transaction |  | $ 164,000,000.0 | $ 134,600,000 |  |  |  |
Over-Allotment Option |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Shares issued and sold (in shares) | shares | 288,461 |  |  |  |  |  |
Sale of stock, consideration received on transaction | $ 24,700,000 |  |  |  |  |  |
XynManagement, Inc. |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Number of unique solutions | uniqueSolution |  |  |  |  | 2 |  |
Medicare | AlloSure Kidney |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Reimbursement rate |  |  |  |  | $ 2,841 |  |
Medicare | AlloMap Heart |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Reimbursement rate |  |  |  |  | 3,240 |  |
Medicare | AlloSure Heart |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |
Reimbursement rate |  |  |  |  | $ 2,753 |  |

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