Revenue (Revenue By Geography) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Geographic Information
Total revenue	$ 16,146	$ 11,900
Qsymia
Geographic Information
Total revenue	8,423	9,632
PANCREAZE
Geographic Information
Total revenue	5,644
STENDRA/SPEDRA
Geographic Information
Total revenue	2,079	2,268
U.S.
Geographic Information
Total revenue	13,497	10,179
ROW
Geographic Information
Total revenue	2,649	1,721
Germany
Geographic Information
Total revenue	2,000	1,700
Canada
Geographic Information
Total revenue	600
Net Product Revenue
Geographic Information
Total revenue	13,497	9,632
Net Product Revenue | Qsymia
Geographic Information
Total revenue	8,423	9,632
Net Product Revenue | PANCREAZE
Geographic Information
Total revenue	5,074
Net Product Revenue | U.S. | Qsymia
Geographic Information
Total revenue	8,423	9,632
Net Product Revenue | U.S. | PANCREAZE
Geographic Information
Total revenue	5,074
Royalty Revenue
Geographic Information
Total revenue	1,045	585
Royalty Revenue | PANCREAZE
Geographic Information
Total revenue	570
Royalty Revenue | STENDRA/SPEDRA
Geographic Information
Total revenue	475	585
Royalty Revenue | ROW | PANCREAZE
Geographic Information
Total revenue	570
Royalty Revenue | ROW | STENDRA/SPEDRA
Geographic Information
Total revenue	475	585
Supply Revenue
Geographic Information
Total revenue	1,604	1,683
Supply Revenue | STENDRA/SPEDRA
Geographic Information
Total revenue	1,604	1,683
Supply Revenue | U.S. | STENDRA/SPEDRA
Geographic Information
Total revenue		547
Supply Revenue | ROW | STENDRA/SPEDRA
Geographic Information
Total revenue	$ 1,604	$ 1,136