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Commitments and Contingencies - Additional Information (Details) - USD ($)					1 Months Ended		12 Months Ended
	Jan. 31, 2022	May 13, 2021	May 01, 2021	Dec. 02, 2020	Sep. 30, 2020	Aug. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Oct. 31, 2016
Loss Contingencies [Line Items]
Rent expense							$ 1,200,000	$ 1,700,000
Research and development							12,789,000	10,818,000
Revenue Share Agreement \| Oncimmune Limited
Loss Contingencies [Line Items]
Royalty expense							$ 700,000	300,000
Percentage of license agreement and royalty payment related to acquired diagnostic test recognized revenue for non-screening tests							8.00%
Minimum annual volume percentage thereafter							5.00%
Period of escalations of sales							through the first four years of sales
Litigation Claims and Assessments
Loss Contingencies [Line Items]
Accrued legal contingency							$ 210,000
Litigation Claims and Assessments \| Subsequent Event
Loss Contingencies [Line Items]
Final settlement payment to third parties	$ 210,000
Bio-Rad License
Loss Contingencies [Line Items]
Percentage of royalty payments on net revenue						2.50%
Percentage of royalty payments not required on net revenue			2.50%
License expiry date						2024-08
Royalty expense								100,000
CellCarta License
Loss Contingencies [Line Items]
Percentage of royalty payments on net revenue		0.675%
Royalty expense							100,000
Percentage of fee payments on net sales		1.00%
Term of royalty payments from first commercial sale		15 years
Year of ending royalty payments from first commercial sale		2034
AVEO Oncology
Loss Contingencies [Line Items]
Remaining estimated obligation							100,000
Research and development							$ 0	$ 900,000
AVEO Oncology \| NSCLC POC Trial
Loss Contingencies [Line Items]
Responsible percentage of development and regulatory costs									50.00%
Ficlatuzumab \| AVEO Oncology
Loss Contingencies [Line Items]
Percentage of development and regulatory costs exercised using opt-out right					50.00%
Percentage of royalty payments on net sales				10.00%
Percentage of license income generated from licensing				25.00%