|3 Months Ended
Mar. 31, 2020
Revenues disaggregated by category were as follows (in thousands):
The following table summarizes revenues from each of our customers who individually accounted for 10% or more of our total revenues (as a percentage of total revenues):
We commenced commercial sale of TAVALISSE in the U.S. in May 2018 after FDA approval in April 2018. Our MAA for fostamatinib for the treatment of chronic ITP in adult patients who are refractory to other treatments was approved by the EC in January 2020.
In addition to the distribution agreements with our customers, the SDs, we also enter into arrangements with specialty pharmacy providers, in-office dispensing providers, group purchasing organizations, and government entities that provide for government-mandated and/or privately-negotiated rebates, chargebacks and discounts with respect to the purchase of our products which reduced our gross product sales. Also refer to Revenue Recognition policy discussion in Note 3.
The following table summarizes activity in each of the product revenue allowance and reserve categories for the three months ended March 31, 2020 and 2019 (in thousands):
The discounts and allowances from gross product sales for the three months ended March 31, 2020 of $2.7 million in the first table above includes the provision for current period sales of $2.2 million which formed part of Other Accrued Liabilities in the balance sheet of which $3.5 million remained outstanding as of March 31, 2020. Of the $2.7 million discounts and allowances from gross sales, $467,000 is recorded as reduction in accounts receivable and prepaid and other current assets in the balance sheet.
As of March 31, 2020, we have accounts receivable from Aclaris of $1.0 million, relative to the first amendment to the license and collaboration agreement with Aclaris. We determined that no allowance for doubtful accounts was necessary for our accounts receivable as of March 31, 2020.