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Revenue Recognition | 3 Months Ended
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Mar. 31, 2019
Revenue Recognition [Abstract] |
Revenue Recognition | 9. Revenue Recognition All of our product revenue consisted of sales of HEPLISAV-B in the U.S. For the three months ended March 31, 2019 and 2018, our three largest Customers represented approximately 66% and 86% of our product revenue, respectively. The following table summarizes balances and activity in each of the product revenue allowance and reserve categories for the three months ended March 31, 2019 (in thousands):
|  | Chargebacks, distribution fees, discounts and other fees |  |  | Returns |  |  | Total |
Balance at December 31, 2018 |  | $ | 1,736 |  |  | $ | 569 |  |  | $ | 2,305 |
Provision related to current period sales |  |  | 3,080 |  |  |  | 458 |  |  |  | 3,538 |
Credit or payments made during the period |  |  | (1,658 | ) |  |  | (86 | ) |  |  | (1,744 | )
Balance at March 31, 2019 |  | $ | 3,158 |  |  | $ | 941 |  |  | $ | 4,099 |
Reserves for chargebacks and discounts totaling $2.3 million were recorded as reductions of accounts receivable at March 31, 2019. The remaining reserves balances totaling $1.8 million were recorded as accrued liabilities at March 31, 2019.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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