Prepaid expenses and other assets (Tables)

12 Months Ended

Dec. 31, 2012

Prepaid expenses and other assets

Schedule of 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