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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
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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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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