Revenues, Recognition and Allowances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue, net	$ 15,967	$ 18,466	$ 18,341	$ 13,122	$ 16,777	$ 18,294	$ 16,249	$ 14,545	$ 65,896	$ 65,865
Company product sales
Disaggregation of Revenue [Line Items]
Revenue, net									64,291	59,591
Contract manufacturing sales
Disaggregation of Revenue [Line Items]
Revenue, net									1,362	6,047
Research and development services and other income
Disaggregation of Revenue [Line Items]
Revenue, net									243	227
Topical
Disaggregation of Revenue [Line Items]
Revenue, net									46,150	35,118
Injectables
Disaggregation of Revenue [Line Items]
Revenue, net									$ 18,141	$ 24,473