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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
Dec. 31, 2021
USD ($)
Test
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Organization And Description Of Business [Line Items]      
Number of blood based lung cancer test | Test   5  
Number of commercial blood-based test | Test   2  
Number of SARS-CoV-2 test | Test   3  
Common stock, shares authorized   200,000,000 200,000,000
Common stock, par value | $ / shares   $ 0.001 $ 0.001
Preferred stock, shares authorized   5,000,000 5,000,000
Preferred stock, par value | $ / shares   $ 0.001 $ 0.001
Proceeds from initial public offering | $     $ 72,000
Net proceeds | $   $ 16,343  
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  
At-the-Money Offering      
Organization And Description Of Business [Line Items]      
Shares of common stock issued and sold   3,756,994  
Common stock price per share | $ / shares   $ 4.35  
Gross proceeds from sale of common shares | $   $ 16,300  
Net proceeds | $   $ 15,700