Revenues

9 Months Ended

Sep. 30, 2021

Revenues

Revenues

7. Revenues

Revenues disaggregated by category were as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Product sales:
Gross product sales	$	20,546	$	20,318	$	58,692	$	54,042
Discounts and allowances		(4,534)		(4,029)		(13,251)		(10,099)
Total product sales, net		16,012		16,289		45,441		43,943
Revenues from collaborations:
License revenues		2,431		—		70,354		39,858
Development milestones		1,875		2,100		1,875		2,100
Research and development services and others		225		—		1,657		4,270
Total revenues from collaborations		4,531		2,100		73,886		46,228
Government contract		1,000		—		9,500		—
Total revenues	$	21,543	$	18,389	$	128,827	$	90,171

The following table summarizes the percentages of revenues from each of our customers who individually accounted for 10% or more (wherein * denotes less than 10%) of the total net product sales and revenues from collaborations:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
ASD Healthcare and Oncology Supply		25%		48%		15%		26%
McKesson Specialty Care Distribution Corporation		35%		34%		17%		20%
Lilly		12%		—		56%		—
Cardinal Healthcare		18%		*		*		*
Grifols		*		*		*		49%
Daiichi		*		11%		*		*

Our first and only FDA approved product, TAVALISSE®, was approved by the U.S. FDA in April 2018. We commenced commercial sale of TAVALISSE in the U.S. in May 2018. Fostamatinib is marketed in Europe under the

brand name TAVLESSE™ (fostamatinib). In July 2020, Grifols S.A. (Grifols) launched TAVLESSE in the United Kingdom (UK) and Germany. In September 2021, Grifols announced that it began commercializing TAVLESSE in France, Italy and Spain. In December 2020, the Scottish Medicines Consortium accepted TAVLESSE for use in NHS in Scotland.

In addition to the distribution agreements with our customers and 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 above.

The following table summarizes activity in each of the product revenue allowance and reserve categories for the nine months ended September 30, 2021 and 2020 (in thousands):

	Chargebacks,		Government
	Discounts and		and Other
	Fees		Rebates		Returns		Total
Balance at January 1, 2021	$	2,461	$	2,115	$	1,489	$	6,065
Provision related to current period sales		7,326		3,995		739		12,060
Credit or payments made during the period		(7,073)		(3,367)		(387)		(10,827)
Balance at September 30, 2021	$	2,714	$	2,743	$	1,841	$	7,298

	Chargebacks,		Government
	Discounts and		and Other
	Fees		Rebates		Returns		Total
Balance at January 1, 2020	$	1,293	$	1,801	$	238	$	3,332
Provision related to current period sales		5,625		2,775		676		9,076
Adjustment related to prior period sales		(75)		(490)		565		—
Credit or payments made during the period		(5,020)		(2,407)		(72)		(7,499)
Balance at September 30, 2020	$	1,823	$	1,679	$	1,407	$	4,909

Of the $13.3 million discounts and allowances from gross product sales for the nine months ended September 30, 2021, $12.1 million was accounted for as additions to other accrued liabilities and $1.2 million as reductions in accounts receivable and prepaid and other current assets in the balance sheet. Other accrued liabilities related to the discounts and allowances had a remaining outstanding balance of $7.3 million as of September 30, 2021.

Of the $10.1 million discounts and allowances from gross product sales for the nine months ended September 30, 2020, $9.1 million was accounted for as additions to other accrued liabilities and $1.0 million as reductions in accounts receivable and prepaid and other current assets in the balance sheet. Other accrued liabilities related to the discounts and allowances had a remaining outstanding balance of $4.9 million as of September 30, 2020.