Net Sales by Product (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Summary of Net Sales by Product

The following table presents net sales by product for each of the years ended December 31 (in thousands):

	Year ended December 31,
	2018		2017		2016
BELBUCA	$	45,988	$	26,980	$	—
BUNAVAIL		5,422		7,942		8,266
Net product sales	$	51,410	$	34,922	$	8,266