Revenues

Product Revenues

The Company’s net product revenues consisted of the following for the years ended December 31:



	2015		2014		2013
Products:
Acetadote	$	8,489,167	$	11,906,232	$	18,846,753
Omeclamox-Pak	3,037,078		4,111,916		1,045,815
Kristalose	15,733,327		14,932,271		9,118,475
Vaprisol	2,641,484		3,011,997		—
Caldolor	3,112,128		2,721,346		2,089,655
Total net product revenues	$	33,013,184	$	36,683,762	$	31,100,698

As discussed in Note 3, the Company acquired rights to Omeclamox-Pak and Vaprisol and both products contributed to Cumberland's net revenue during 2015 and 2014. On October 28, 2013, Cumberland entered into an agreement with Pernix to distribute and promote Omeclamox-Pak. Under the terms of the agreement, effective October 1, 2013, the Company began to record the revenue of this product and effective January 2014 Cumberland began distributing Omeclamox-Pak and promoting it to gastroenterologists across the United States. On February 28, 2014, Cumberland entered into an agreement with Astellas to acquire Vaprisol including certain product rights, intellectual property and related assets. The Company began selling Vaprisol in March 2014 and launched promotional efforts for the brand in May 2014.

Cumberland supplies Perrigo Company ("Perrigo") with an Authorized Generic version of the Company's Acetadote product. The Company's revenue generated by sales of its Authorized Generic distributed by Perrigo is included in the Acetadote product revenue presented above. The Company's share of Authorized Generic revenue was $4.5 million, $5.8 million and $9.2 million during 2015, 2014 and 2013, respectively.

In 2011, the Company discontinued sales of the 400mg Caldolor offering domestically and focused on the 800mg Caldolor offering. During 2015 and 2014, Cumberland had total sales of $0.8 million and $0.5 million of its 400mg Caldolor offering outside the United States, respectively.

The allowances in accounts receivable for chargebacks, cash discounts and damaged goods were $0.4 million at December 31, 2015 and $0.4 million at December 31, 2014, and the accruals for rebates, product returns and certain administrative and service fees included in other current liabilities were $6.8 million and $5.2 million, at December 31, 2015 and 2014, respectively.

Other Revenues

The Company has entered into agreements, beginning in 2012, with international partners for commercialization of the Company's products. The international agreements provide that each of the partners are responsible for seeking regulatory approvals for the products, and following approvals, each partner will handle ongoing distribution and sales in the respective international territories. The Company maintains responsibility for the intellectual property and product formulations. Under the international agreements, the Company is entitled to receive non-refundable up-front payments at the time the agreements are entered into and milestone payments upon the partners' achievement of defined regulatory approvals and sales milestones. The Company will recognize revenue for these substantive milestones using the milestone method. The Company is also entitled to receive royalties on future sales of the products under the agreements. The international agreements provide for $1.4 million in non-refundable up-front payments and milestone payments of up to $1.7 million related to regulatory approvals and up to $4.7 million in payments related to product sales. As of December 31, 2015, the Company has recognized a cumulative $1.5 million in upfront payments as other revenue and has not yet recorded any revenue related to the milestone payments associated with these international agreements.

Other revenues during 2015, 2014 and 2013 also includes revenue generated by CET through grant funding from federal Small Business grant programs, and lease income generated by CET’s Life Sciences Center and contract services. The Life Sciences Center is a research center that provides scientists with access to flexible lab space and other resources to develop biomedical products. Grant revenue from SBIR/STTR programs totaled approximately $0.2 million for the year ending December 31, 2015 and $0.1 million for each of the years ended December 31, 2014 and 2013.