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Summary of Significant Accounting Policies - (Tables)
9 Months Ended
Sep. 30, 2020
Accounting Policies [Abstract]  
Schedule of Concentration of Risk, by Risk Factor and Significant Payer For each significant payer 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
September 30,
Nine Months Ended
September 30,
 2020201920202019
Medicare20 %25 %21 %26 %
Janssen (SIMPONI®)
13 %*12 %*
Blue Shield12 %13 %12 %13 %
Medicare Advantage11 %12 %11 %11 %
United Healthcare*10 %*10 %

 Accounts Receivable
 September 30, 2020December 31, 2019
 
Janssen (SIMPONI®)
37 %19 %
Anthem Blue Cross Blue Shield12 %*
Blue Shield10 %15 %
United Healthcare*22 %

*Less than 10%.
Disaggregation of Revenue
The following table includes the Company's revenues as disaggregated by payer and customer category (in thousands):
 
 Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
Revenue:
Healthcare insurers$5,749 $6,188 $15,949 $17,716 
Government2,184 2,665 6,236 7,964 
Client1,260 1,007 3,088 3,200 
Other(1)235 148 636 458 
Janssen (SIMPONI®)
1,347 431 3,398 835 
Total revenue$10,775 $10,439 $29,307 $30,173 
(1)Includes patient self-pay that is immaterial.
Schedule of Restricted Cash and Cash Equivalents
Cash, cash equivalents and restricted cash presented in the accompanying condensed statements of cash flows consist of the following (in thousands):
 
 September 30, 2020December 31, 2019
 
Cash and cash equivalents$61,434 $72,084 
Restricted cash100 100 
$61,534 $72,184 
Schedule of Cash and Cash Equivalents
Cash, cash equivalents and restricted cash presented in the accompanying condensed statements of cash flows consist of the following (in thousands):
 
 September 30, 2020December 31, 2019
 
Cash and cash equivalents$61,434 $72,084 
Restricted cash100 100 
$61,534 $72,184 
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):
 
 Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
Warrants to purchase common stock426,827 461,273 426,827 461,273 
Common stock options1,975,250 1,475,006 1,975,250 1,475,006 
Total2,402,077 1,936,279 2,402,077 1,936,279