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Summary of Significant Accounting Policies - (Tables) | 3 Months Ended
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Mar. 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
|  | Three Months Ended March 31, |  |
|  | 2021 |  | 2020 |  |  |  |
Medicare |  | 18 | % |  | 25 | % |  |  |  |
Blue Shield |  | 12 | % |  | 12 | % |  |  |  |
Medicare Advantage |  | 12 | % |  | 13 | % |  |  |  |
United Healthcare |  | * |  | 10 | % |  |  |  |
* |  | Less than 10%.
|  |  |  | Accounts Receivable
|  |  |  | March 31, 2021 |  | December 31, 2020
Janssen (SIMPONI®) |  |  |  | 25 | % |  | 35 | %
Blue Shield |  |  |  | 13 | % |  | 11 | %
* |  | 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 March 31, |  |
|  | 2021 |  | 2020 |  |  |  |
Revenue: |  |  |  |  |  |  |  |
Healthcare insurers |  | $ | 6,027 |  |  | $ | 6,062 |  |  |  |  |
Government |  | 2,009 |  |  | 2,245 |  |  |  |  |
Client(1) |  | 1,965 |  |  | 1,082 |  |  |  |  |
Other(2) |  | 286 |  |  | 195 |  |  |  |  |
Janssen (SIMPONI®) |  | 300 |  |  | — |  |  |  |  |
Total revenue |  | $ | 10,587 |  |  | $ | 9,584 |  |  |  |  |
(1)Includes hospitals, other laboratories, etc. (2)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):
|  |  |  | March 31, 2021 |  | December 31, 2020
Cash and cash equivalents |  |  |  | $ | 118,050 |  |  | $ | 57,448 |
Restricted cash |  |  |  | 100 |  |  | 100 |
|  |  |  | $ | 118,150 |  |  | $ | 57,548 |
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):
|  |  |  | March 31, 2021 |  | December 31, 2020
Cash and cash equivalents |  |  |  | $ | 118,050 |  |  | $ | 57,448 |
Restricted cash |  |  |  | 100 |  |  | 100 |
|  |  |  | $ | 118,150 |  |  | $ | 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):
|  | Three Months Ended March 31, |  |
|  | 2021 |  | 2020 |  |  |  |
Warrants to purchase common stock |  | 426,827 |  |  | 436,581 |  |  |  |  |
Common stock options |  | 2,041,580 |  |  | 1,630,014 |  |  |  |  |
Restricted stock units |  | 185,000 |  |  | — |  |  |  |  |
Employee stock purchase plan |  | 2,869 |  |  | 2,021 |  |  |  |  |
Total |  | 2,656,276 |  |  | 2,068,616 |  |  |  |  |

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