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Organization and Description of Business - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 27, 2020 USD ($) $ / shares shares | Oct. 19, 2020 | Dec. 31, 2020 USD ($) Test $ / shares shares | Oct. 31, 2020 $ / shares shares | Dec. 31, 2019 $ / shares shares
Organization And Description Of Business [Line Items] |  |  |  |  |
Number of blood based lung cancer test | Test |  |  | 4 |  |
Number of commercial blood-based test | Test |  |  | 2 |  |
Number of SARS-CoV-2 test | Test |  |  | 2 |  |
Reverse stock split, description |  |  | 0.1684664-for-1 |  |
Reverse stock split ratio |  | 0.1684664 |  |  |
Common stock, shares authorized |  |  | 200,000,000 | 200,000,000 | 190,000,000
Common stock, par value | $ / shares |  |  | $ 0.001 | $ 0.001 | $ 0.001
Preferred stock, shares authorized |  |  | 5,000,000 | 5,000,000 | 0
Preferred stock, par value | $ / shares |  |  | $ 0.001 | $ 0.001 | $ 0.001
Proceeds from initial public offering | $ |  |  | $ 72,000 |  |
Warrants to purchase shares of common stock |  |  | 103,326 |  |
Initial Public Offering |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |
Shares of common stock issued and sold | 4,000,000 |  |  |  |
Common stock price per share | $ / shares | $ 18.00 |  |  |  |
Proceeds from initial public offering | $ | $ 63,800 |  |  |  |
Convertible preferred stock and convertible notes payable converted into shares of common stock | 21,939,025 |  |  |  |
Warrants to purchase shares of common stock | 103,326 |  | 103,326 |  |

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