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Revenue Recognition | 3 Months Ended
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Mar. 31, 2021
Revenue Recognition [Abstract] |
Revenue Recognition | 8. Revenue Recognition 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 |
All of our HEPLISAV-B sales were in the U.S. For the three months ended March 31, 2021 and 2020, our three largest Customers collectively represented approximately 75% and 68% of our HEPLISAV-B product revenue, respectively. All of our CpG 1018 sales were outside the U.S. For the three months ended March 31, 2021, one customer represented approximately 87% of our CpG 1018 product revenue. 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 The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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