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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2021
Summary of Product Revenue | Our product revenue, net consisted of the following:
|  | Three Months Ended |
|  | March 31, |
|  | 2021 |  |  | 2020 |
HEPLISAV-B |  | $ | 8,303 |  |  | $ | 10,514 |
CpG 1018 |  |  | 74,582 |  |  |  | - |
Total |  | $ | 82,885 |  |  | $ | 10,514 |
HEPLISAV-B |
Summary of Product Revenue Allowance and Reserve Categories | The following table summarizes balances and activity in HEPLISAV-B product revenue allowance and reserve categories for the three months ended March 31, 2021 (in thousands):
|  | Balance at Beginning of Period |  |  | Provisions related to current period sales |  |  | Credit or payments made during the period |  |  | Balance at End of Period |
Three months ended March 31, 2021: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable reserves(1) |  | $ | 2,836 |  |  | $ | 1,962 |  |  | $ | (2,469 | ) |  | $ | 2,329 |
Revenue reserve accruals(2) |  | $ | 6,040 |  |  | $ | 1,641 |  |  | $ | (1,533 | ) |  | $ | 6,148 |
(1) | Reserves are for chargebacks, discounts and other fees.
(2) | Accruals are for returns, rebates and other fees.

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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