Note 4. Prepaid expenses and other assets

Prepaid expenses and other assets consist of (in thousands):

	Balance as of

	December 31, 2012		December 31, 2011
Interest receivable	$	743	$	725
Prepaid insurance		6,979		672
Prepaid sales and marketing expenses		5,735		—
Manufacturing capacity commitment fees		2,300		—
Prepaid medical affairs expenses		1,782		—
Other prepaid expenses and assets		1,907		396

Total	$	19,446	$	1,793

The amounts included in prepaid expenses and other assets consist of interest receivable, deposits and prepayments for future services, primarily related to prepaid product commercialization costs for services relating to future periods in support of the commercial launch of Qsymia in the U.S., prepayments related to medical affairs activities for Qsymia and STENDRA, and manufacturing capacity commitment fees, and prepaid insurance. These amounts represent probable future economic benefits obtained or controlled by the Company as a result of past transactions or events, which meet the definition of an asset under FASB Concept Statement 6. As such, these costs have been deferred as prepaid expenses and other assets on the consolidated balance sheet and will be either (i) charged to expense accordingly when the related prepaid services are rendered to the Company, or (ii) converted to cash when the receivables are collected by the Company.