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Revenue Recognition | 6 Months Ended
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Jun. 30, 2021
Revenue Recognition [Abstract] |
Revenue Recognition | 9. Revenue Recognition Disaggregation of Revenues The following table disaggregates our product revenue, net by product and geographic region and disaggregates our other revenues by geographic region (in thousands):
|  | Three Months Ended |  |  | Three Months Ended |
|  | June 30, 2021 |  |  | June 30, 2020 |
|  | U.S. |  |  | Non U.S. |  |  | Total |  |  | U.S. |  |  | Non U.S. |  |  | Total |
Product revenue, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HEPLISAV-B |  | $ | 13,688 |  |  | $ | - |  |  | $ | 13,688 |  |  | $ | 2,405 |  |  | $ | - |  |  | $ | 2,405 |
CpG 1018 |  |  | - |  |  |  | 38,989 |  |  |  | 38,989 |  |  |  | - |  |  |  | - |  |  |  | - |
Total product revenue, net |  | $ | 13,688 |  |  | $ | 38,989 |  |  | $ | 52,677 |  |  | $ | 2,405 |  |  | $ | - |  |  | $ | 2,405 |
Other revenue |  |  | - |  |  |  | 90 |  |  |  | 90 |  |  |  | - |  |  |  | 263 |  |  |  | 263 |
Total revenues |  | $ | 13,688 |  |  | $ | 39,079 |  |  | $ | 52,767 |  |  | $ | 2,405 |  |  | $ | 263 |  |  | $ | 2,668 |
|  | Six Months Ended |  |  | Six Months Ended |
|  | June 30, 2021 |  |  | June 30, 2020 |
|  | U.S. |  |  | Non U.S. |  |  | Total |  |  | U.S. |  |  | Non U.S. |  |  | Total |
Product revenue, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HEPLISAV-B |  | $ | 21,991 |  |  | $ | - |  |  | $ | 21,991 |  |  | $ | 12,919 |  |  | $ | - |  |  | $ | 12,919 |
CpG 1018 |  |  | - |  |  |  | 113,571 |  |  |  | 113,571 |  |  |  | - |  |  |  | - |  |  |  | - |
Total product revenue, net |  | $ | 21,991 |  |  | $ | 113,571 |  |  | $ | 135,562 |  |  | $ | 12,919 |  |  | $ | - |  |  | $ | 12,919 |
Other revenue |  |  | 260 |  |  |  | 280 |  |  |  | 540 |  |  |  | - |  |  |  | 668 |  |  |  | 668 |
Total revenues |  | $ | 22,251 |  |  | $ | 113,851 |  |  | $ | 136,102 |  |  | $ | 12,919 |  |  | $ | 668 |  |  | $ | 13,587 |
Revenues from Major Customers The following table summarizes HEPLISAV-B product revenue from each of our three largest Customers (as a percentage of total HEPLISAV-B product revenue):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Largest Customer |  |  | 28 | % |  |  | 40 | % |  |  | 28 | % |  |  | 25 | %
Second largest Customer |  |  | 21 | % |  |  | 26 | % |  |  | 23 | % |  |  | 24 | %
Third largest Customer |  |  | 16 | % |  |  | 17 | % |  |  | 17 | % |  |  | 17 | %
The following table summarizes CpG 1018 product revenue from each of our two largest collaboration partners (as a percentage of total CpG 1018 product revenue):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Largest collaboration partner |  |  | 63 | % |  |  | 0 | % |  |  | 79 | % |  |  | 0 | %
Second largest collaboration partner |  |  | 27 | % |  |  | 0 | % |  |  | 15 | % |  |  | 0 | %
Contract Balances The following table summarizes balances and activities in HEPLISAV-B product revenue allowance and reserve categories for the six months ended June 30, 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 |
Six months ended June 30, 2021: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable reserves(1) |  | $ | 2,836 |  |  | $ | 7,345 |  |  | $ | (6,820 | ) |  | $ | 3,361 |
Revenue reserve accruals(2) |  | $ | 6,040 |  |  | $ | 4,117 |  |  | $ | (3,104 | ) |  | $ | 7,053 |
(1) | Reserves are for chargebacks, discounts and other fees.
(2) | Accruals are for returns, rebates and other fees.
Payments received or invoices issued before we satisfy our performance obligations are recorded as deferred revenue until we satisfy such performance obligations. Our deferred revenue activities are related to CpG 1018 product sales. The following table summarizes balances and activities in our deferred revenue accounts for the six months ended June 30, 2021 (in thousands):
|  | Balance at Beginning of Period |  |  | Additions (1) |  |  | Subtractions (2) |  |  | Revenue recognized in the current period included in deferred revenue balance at the beginning of the period |  |  | Balance at End of Period |
Six months ended June 30, 2021: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  | $ | 38,212 |  |  | $ | 140,596 |  |  | $ | (12,199 | ) |  | $ | (37,052 | ) |  | $ | 129,557 |
Long-term deferred revenue |  |  | - |  |  |  | 109,532 |  |  |  | (2,582 | ) |  |  | - |  |  |  | 106,950 |
(1) | Additions are primarily payments received or invoices issued before we satisfy our performance obligations.
(2) | Subtractions are primarily revenues recognized in the period included in deferred revenue during the period.

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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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