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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2023
Accounting Policies [Abstract]  
Schedule of Concentration of Risk, by Risk Factor and Significant Payer For each significant payor and customer, revenue as a percentage of total revenue and accounts receivable as a percentage of total accounts receivable are as follows:
 
 Revenue
 Three Months Ended
March 31,
 20232022
Medicare39 %20 %
Medicare Advantage16 %15 %
Blue Shield*13 %
*Less than 10%.

Accounts Receivable, Net
 March 31, 2023December 31, 2022
Medicare45 %21 %
Medicare Advantage10 %13 %
Disaggregation of Revenue The following table includes the Company's revenues as disaggregated by payor and customer category (in thousands):
 
 Three Months Ended March 31,
 20232022
Revenue:
Commercial$4,215 $6,423 
Government4,426 2,120 
Client(1)2,407 1,591 
Other(2)182 260 
Total revenue$11,230 $10,394 
(1)Includes hospitals, other laboratories, etc.
(2)Includes patient self-pay.
Schedule of Restricted Cash and Cash Equivalents
Cash, cash equivalents and restricted cash presented in the accompanying statements of cash flows consist of the following (in thousands):
 
 March 31, 2023March 31, 2022
Cash and cash equivalents$52,184 $89,751 
Restricted cash200 100 
$52,384 $89,851 
Schedule of Cash and Cash Equivalents
Cash, cash equivalents and restricted cash presented in the accompanying statements of cash flows consist of the following (in thousands):
 
 March 31, 2023March 31, 2022
Cash and cash equivalents$52,184 $89,751 
Restricted cash200 100 
$52,384 $89,851 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Potentially dilutive securities not included in the calculation of diluted net loss per share, because to do so would be anti-dilutive, are as follows (in common stock equivalent shares): 
 March 31,
 20232022
Warrants to purchase common stock409,108 409,108 
Common stock options1,019,076 2,002,039 
Restricted stock units1,494,085 878,575 
Employee stock purchase plan14,736 6,929 
Total2,937,005 3,296,651