Product Revenue

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

We sell TIBSOVO®, our wholly owned product, to a limited number of specialty distributors and specialty pharmacy providers in the U.S., or collectively, the Customers. The Customers subsequently resell TIBSOVO® to pharmacies or dispense directly to patients. In addition to distribution agreements with Customers, we enter into arrangements with healthcare providers and payors that provide for government-mandated and/or privately-negotiated rebates, chargebacks and discounts with respect to the purchase of TIBSOVO®.

The performance obligation related to the sale of TIBSOVO® is satisfied and revenue is recognized when the Customer obtains control of the product, which occurs at a point in time, typically upon delivery to the Customer.

Reserves for Variable Consideration

Revenues from product sales are recorded at the net sales price, or transaction price, which includes estimates of variable consideration for which reserves are established and result from contractual adjustments, government rebates, returns and other allowances that are offered within the contracts with our Customers, healthcare providers, payors and other indirect customers relating to the sale of our products.

Contractual Adjustments

We generally provide Customers with discounts, including prompt pay discounts, and allowances that are explicitly stated in the contracts and are recorded as a reduction of revenue in the period the related product revenue is recognized. In addition, we receive sales order management, data and distribution services from certain Customers.

Chargebacks for fees and discounts represent the estimated obligations resulting from contractual commitments to sell products to qualified healthcare providers at prices lower than the list prices charged to Customers who directly purchase the product from us. Customers charge us for the difference between what they pay for the product and the ultimate selling price to the qualified healthcare providers. These reserves are estimated using the expected value method, based upon a range of possible outcomes that are probability-weighted for the estimated channel mix and are established in the same period that the related revenue is recognized, resulting in a reduction of product revenue.

Government Rebates

Government rebates consist of Medicare, TriCare, and Medicaid rebates, which we estimate using the expected value method, based upon a range of possible outcomes that are probability-weighted for the estimated payor mix. These reserves are recorded in the same period the related revenue is recognized, resulting in a reduction of product revenue. For Medicare, we also estimate

the number of patients in the prescription drug coverage gap for whom we will owe an additional liability under the Medicare Part D program.

Returns

We estimate the amount of product sales that may be returned by Customers and record this estimate as a reduction of revenue in the period the related product revenue is recognized. We currently estimate product return liabilities using the expected value method, based on available industry data, including our visibility into the inventory remaining in the distribution channel.

Total net product revenue from U.S. sales of TIBSOVO®, which is our only source of product revenue, was $17.4 million and $40.3 million for the three and nine months ended September 30, 2019, respectively, and $4.5 million for the three and nine months ended September 30, 2018. The following table summarizes balances and activity in each of the product revenue allowance and reserve categories for the nine months ended September 30, 2019 (in thousands):


	Contractual Adjustments		Government Rebates		Returns		Total
Balance at December 31, 2018	$	592	$	325	$	334	$	1,251
Current provisions relating to sales in the current year	5,596		1,402		1,003		8,001
Adjustments relating to prior years	8		(48)		—		(40)
Payments/returns relating to sales in the current year	(4,583)		(714)		—		(5,297)
Payments/returns relating to sales in the prior years	(598)		(261)		—		(859)
Balance at September 30, 2019	$	1,015	$	704	$	1,337	$	3,056

Total revenue-related reserves above, included in our condensed consolidated balance sheets, are summarized as follows (in thousands):


	September 30, 2019		December 31, 2018
Reduction of accounts receivable	$	549	$	326
Component of accrued expenses	2,507		925
Total revenue-related reserves	$	3,056	$	1,251

The following table presents changes in our contract assets during the nine months ended September 30, 2019 (in thousands):


	December 31, 2018		Additions		Deductions		September 30, 2019
Contract assets (1)
Accounts receivable, net	$	5,076	$	48,219	$	(46,189)	$	7,106

(1) Additions to contract assets relate to amounts billed to Customers for product sales during the reporting period. Deductions to contract assets primarily relate to collection of receivables during the reporting period.