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Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Deferred revenue | $ 3,522 | $ 3,530
Clinical studies | 7,023 | 6,733
Deferred payments for intangible assets | 2,000 | 2,000
Short-term lease liability | 3,126 | 2,033
Test sample processing fees | 505 | 416
Accrued royalty | 1,342 | 1,072
Contingent consideration | 694 | 738
Professional fees | 2,393 | 1,529
Other accrued expenses | 3,033 | 2,551
Total accrued and other liabilities | $ 23,638 | $ 20,602

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