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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2020
Summary of Product Revenue | Our product revenue, net consisted of the following:
|  | Year Ended |
|  | December 31 |
|  | 2020 |  |  | 2019 |  |  | 2018 |
HEPLISAV-B |  | $ | 36,030 |  |  | $ | 34,644 |  |  | $ | 6,812 |
CpG 1018 |  |  | 3,277 |  |  |  | - |  |  |  | - |
Total |  | $ | 39,307 |  |  | $ | 34,644 |  |  | $ | 6,812 |
HEPLISAV-B |
Summary of Product Revenue Allowance and Reserve Categories | The following table summarizes balances and activities in HEPLISAV-B product revenue allowance and reserve categories for the year ended December 31, 2020 and 2019 (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 |
Year ended December 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable reserves(1) |  | $ | 2,701 |  |  | $ | 11,417 |  |  | $ | (11,282 | ) |  | $ | 2,836 |
Revenue reserve accruals(2) |  | $ | 3,893 |  |  | $ | 6,694 |  |  | $ | (4,547 | ) |  | $ | 6,040 |
Year ended December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable reserves(1) |  | $ | 1,272 |  |  | $ | 11,042 |  |  | $ | (9,613 | ) |  | $ | 2,701 |
Revenue reserve accruals(2) |  | $ | 1,033 |  |  | $ | 6,632 |  |  | $ | (3,772 | ) |  | $ | 3,893 |
(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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