2.	REVENUE RECOGNITION AND RELATED ALLOWANCES

Revenue Recognition

Revenue is recognized for product sales and contract manufacturing product sales upon passing of risk and title to the customer, when estimates of the selling price and discounts, rebates, promotional adjustments, price adjustments, returns, chargebacks, and other potential adjustments are reasonably determinable, collection is reasonably assured, and we have no further performance obligations. Contract manufacturing arrangements are typically less than two weeks in duration, and therefore the revenue is recognized upon completion of the aforementioned factors rather than using a proportional performance method of revenue recognition. The estimates for discounts, rebates, promotional adjustments, price adjustments, returns, chargebacks, and other potential adjustments reduce gross revenues to net revenues in the accompanying unaudited interim condensed consolidated statements of earnings, and are presented as current liabilities or reductions in accounts receivable in the accompanying unaudited interim condensed consolidated balance sheets (see “Accruals for Chargebacks, Rebates, Returns, and Other Allowances”). Historically, we have not entered into revenue arrangements with multiple elements.

Occasionally, we engage in contract services, which include product development services, laboratory services, and royalties on net sales of certain contract manufactured products. For these services, revenue is recognized according to the terms of the agreement with the customer, which sometimes include substantive, measurable risk-based milestones, and when we have a contractual right to receive such payment, the contract price is fixed or determinable, the collection of the resulting receivable is reasonably assured, and we have no further performance obligations under the agreement.

Accruals for Chargebacks, Rebates, Returns, and Other Allowances

Our generic and branded product revenues are typically subject to agreements with customers allowing chargebacks, Medicaid rebates, product returns, administrative fees and other rebates, and prompt payment discounts. We accrue for these items at the time of sale and continually monitor and re-evaluate the accruals as additional information becomes available. We adjust the accruals at the end of each reporting period, to reflect any such updates to the relevant facts and circumstances. Accruals are relieved upon receipt of payment from the customer or upon issuance of credit to the customer.

The following table summarizes activity in the consolidated balance sheets for accruals and allowances for the three month periods ended March 31, 2016 and 2015, respectively:

(in thousands)	Accruals for Chargebacks, Rebates, Returns and Other Allowances
							Administrative		Prompt
			Medicaid				Fees and Other		Payment
	Chargebacks		Rebates		Returns		Rebates		Discounts
Balance at December 31, 2014	$	6,865	$	2,264	$	1,445	$	1,487	$	471
Accruals/Adjustments		10,260		953		566		1,472		609
Credits Taken Against Reserve		(10,526)		(1,140)		(194)		(1,825)		(602)
Balance at March 31, 2015	$	6,599	$	2,077	$	1,817	$	1,134	$	478

Balance at December 31, 2015	$	11,381	$	4,631	$	2,648	$	1,653	$	674
Accruals/Adjustments		14,778		2,607		1,637		2,089		813
Credits Taken Against Reserve		(15,256)		(3,814)		(1,619)		(1,470)		(835)
Balance at March 31, 2016	$	10,903	$	3,424	$	2,666	$	2,272	$	652

Credit Concentration

Our customers are primarily wholesale distributors, chain drug stores, group purchasing organizations, and pharmaceutical companies.

During the three month period ended March 31, 2016, three customers represented 29%, 20%, and 16% of net revenues, respectively, and accounts receivable from these customers totaled 67% of accounts receivable, net as of March 31, 2016. During the three month period ended March 31, 2015, three customers represented 28%, 24%, and 19% of net revenues, respectively.