I. CURRENT AND LONG-TERM LIABILITIES

Accrued Expenses

Accrued expenses consisted of the following as of December 31, 2015 and 2014 (in thousands):


	December 31,
	2015		2014
Commercial rebates, fees and returns	$	45,161	$	44,807
Professional, license, and other fees and expenses		27,070		15,857
Interest expense		18,411		7,300
Salaries, bonuses, and other compensation		12,838		10,176
Restructuring expense		2,883		1,953
Total accrued expenses	$	106,363	$	80,093

Deferred Revenues

Our deferred revenues balance as of December 31, 2015 is primarily related to our CBR service revenues and includes: (i) amounts collected in advance of unit processing and (ii) amounts associated with unearned storage fees collected at the beginning of the storage contract term, net of allocated discounts. Our deferred revenues balance as of December 31, 2014 included amortization of upfront payments and milestone payments recognized under the Takeda Agreement, under which Takeda had exclusive rights to develop and commercialize Feraheme as a therapeutic agent in certain agreed-upon territories outside of the U.S. In December 2014, we entered into a termination agreement with Takeda (the “Takeda Termination Agreement”), which terminated the obligations between the parties on a rolling basis, with final termination effective in June 2015. In connection with the final termination of the Takeda Agreement, in 2015 we recognized into revenues the remaining balance of $44.4 million of deferred revenue related to the upfront and milestone payments we received from Takeda during the life of the agreement and recorded it in license fee, collaboration and other revenues in our 2015 consolidated statement of operations.

Other Long‑Term Liabilities

Other long-term liabilities at December 31, 2015 and 2014 consisted of deferred rent related to the lease of our principal executive offices in Waltham, Massachusetts as well as our lease obligations assumed under the lease of Lumara Health’s former principal executive offices in St. Louis, Missouri, which was terminated in May 2015. In addition, other long-term liabilities include future payments to be made to certain states in compliance with a 2011 Lumara Health Settlement Agreement with the Department of Justice, which resolved certain claims under the qui tam provisions of the False Claims Act.