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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2022
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 June 30, |  | Six Months Ended June 30,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Medicare Advantage |  | 23 | % |  | 13 | % |  | 19 | % |  | 12 | %
Medicare |  | 19 | % |  | 19 | % |  | 20 | % |  | 19 | %
Aetna |  | 11 | % |  | * |  | * |  | *
Blue Shield |  | * |  | 11 | % |  | * |  | 11 | %
* |  | Less than 10%.
|  |  |  | Accounts Receivable, Net
|  |  |  | June 30, 2022 |  | December 31, 2021
United Healthcare |  |  |  | 13 | % |  | 18 | %
Medicare |  |  |  | 13 | % |  | *
Medicare Advantage |  |  |  | 11 | % |  | *
Aetna |  |  |  | 10 | % |  | *
Blue Shield |  |  |  | * |  | 19 | %
* |  | Less than 10%.
Disaggregation of Revenue | The following table includes the Company's revenues as disaggregated by payor and customer category (in thousands):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Revenue: |  |  |  |  |  |  |  |
Healthcare insurers |  | $ | 5,286 |  |  | $ | 7,381 |  |  | $ | 11,709 |  |  | $ | 13,408 |
Government |  | 1,689 |  |  | 2,394 |  |  | 3,809 |  |  | 4,403 |
Client(1) |  | 1,785 |  |  | 2,427 |  |  | 3,376 |  |  | 4,392 |
Other(2) |  | 202 |  |  | 270 |  |  | 462 |  |  | 556 |
Janssen (SIMPONI®) |  | — |  |  | 300 |  |  | — |  |  | 600 |
Total revenue |  | $ | 8,962 |  |  | $ | 12,772 |  |  | $ | 19,356 |  |  | $ | 23,359 |
(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 condensed statements of cash flows consist of the following (in thousands):
|  |  |  | June 30, 2022 |  | December 31, 2021
Cash and cash equivalents |  |  |  | $ | 76,387 |  |  | $ | 99,442 |
Restricted cash |  |  |  | 100 |  |  | 100 |
|  |  |  | $ | 76,487 |  |  | $ | 99,542 |
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):
|  |  |  | June 30, 2022 |  | December 31, 2021
Cash and cash equivalents |  |  |  | $ | 76,387 |  |  | $ | 99,442 |
Restricted cash |  |  |  | 100 |  |  | 100 |
|  |  |  | $ | 76,487 |  |  | $ | 99,542 |
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):
|  | June 30, |  |
|  | 2022 |  | 2021 |  |  |  |
Warrants to purchase common stock |  | 409,108 |  |  | 426,827 |  |  |  |  |
Common stock options |  | 1,949,374 |  |  | 2,123,617 |  |  |  |  |
Restricted stock units |  | 784,940 |  |  | 375,525 |  |  |  |  |
Employee stock purchase plan |  | 30,303 |  |  | 12,525 |  |  |  |  |
Total |  | 3,173,725 |  |  | 2,938,494 |  |  |  |  |

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