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Summary of Significant Accounting Policies - (Tables) | 12 Months Ended
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Dec. 31, 2021
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
|  |  |  | Years Ended December 31,
|  |  |  |  |  | 2021 |  | 2020
Medicare |  |  |  |  |  | 19 | % |  | 20 | %
Medicare Advantage |  |  |  |  |  | 13 | % |  | 11 | %
Blue Shield |  |  |  |  |  | 12 | % |  | 11 | %
Janssen (SIMPONI®) |  |  |  |  |  | * |  | 12 | %
* |  | Less than 10%.
|  |  |  | Accounts Receivable
|  |  |  | December 31,
|  |  |  | 2021 |  | 2020
Blue Shield |  |  |  | 19 | % |  | 11 | %
United Healthcare |  |  |  | 18 | % |  | *
Janssen (SIMPONI®) |  |  |  | — | % |  | 35 | %
* |  | Less than 10%.
Disaggregation of Revenue | The following table includes the Company's revenues as disaggregated by payor and customer category (in thousands):
|  |  |  | Years Ended December 31,
|  |  |  |  |  | 2021 |  | 2020
Revenue: |  |  |  |  |  |  |  |
Healthcare insurers |  |  |  |  |  | $ | 27,499 |  |  | $ | 22,456 |
Government |  |  |  |  |  | 9,221 |  |  | 8,446 |
Client(1) |  |  |  |  |  | 9,288 |  |  | 5,109 |
Other(2) |  |  |  |  |  | 1,091 |  |  | 836 |
Janssen (SIMPONI®) |  |  |  |  |  | 1,200 |  |  | 5,128 |
Total revenue |  |  |  |  |  | $ | 48,299 |  |  | $ | 41,975 |
(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):
|  |  |  | December 31,
|  | 2021 |  | 2020
Cash and cash equivalents |  |  |  | $ | 99,442 |  |  | $ | 57,448 |
Restricted cash |  |  |  | 100 |  |  | 100 |
|  |  |  | $ | 99,542 |  |  | $ | 57,548 |
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):
|  |  |  | December 31,
|  | 2021 |  | 2020
Cash and cash equivalents |  |  |  | $ | 99,442 |  |  | $ | 57,448 |
Restricted cash |  |  |  | 100 |  |  | 100 |
|  |  |  | $ | 99,542 |  |  | $ | 57,548 |
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):
|  |  |  | Years Ended December 31,
|  |  |  |  |  | 2021 |  | 2020
Warrants to purchase common stock |  |  |  |  |  | 409,108 |  |  | 426,827 |
Common stock options |  |  |  |  |  | 2,014,330 |  |  | 1,975,761 |
Restricted stock units |  |  |  |  |  | 415,325 |  |  | — |
Employee stock purchase plan |  |  |  |  |  | 20,193 |  |  | 11,640 |
Total |  |  |  |  |  | 2,858,956 |  |  | 2,414,228 |

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