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Summary of Significant Accounting Policies - Additional Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |
Number of operating segments | segment | 1 |
Deferred revenue | $ 3,532,000 | $ 1,283,000
Allowance for doubtful accounts | 200,000 | 200,000
Impairment of long-lived assets | 0 | 0
Impairment of intangible assets | 0 | 0
Goodwill impairments loss | $ 0 | 0
Minimum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Property, plant and equipment, useful Lives | 3 years |
Minimum | Product Life and Patent Life |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Finite-lived intangible asset, useful life | 9 years |
Maximum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Property, plant and equipment, useful Lives | 5 years |
Maximum | Product Life and Patent Life |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Finite-lived intangible asset, useful life | 10 years |
Other Current Assets |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Restricted cash | $ 200,000 | 200,000
Inventory | $ 3,200,000 | $ 800,000
Revenue | Customer Concentration Risk |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Concentration risk, percentage | 47.00% |
Revenue | Customer Concentration Risk | Covance Central Laboratory Services |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Concentration risk, percentage |  | 21.00%
Revenue | Customer Concentration Risk | Medicare |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Concentration risk, percentage | 17.00% | 36.00%
Testing Services |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Deferred revenue | $ 2,800,000 |
Revision of Prior Period, Error Correction, Adjustment |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Increase in goodwill |  | $ 3,400,000
Reduction in accumulated deficit |  | $ 3,400,000
Error corrections and prior period adjustments, description | The 2019 balance sheet has been updated to reflect an increase in goodwill and a reduction in accumulated deficit of $3.4 million related to the correction of an immaterial error recorded as part of the acquisition of Integrated Diagnostics, Inc. in 2018. |

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