Revenues, Recognition and Allowances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue, net	$ 18,466	$ 18,294	$ 49,929	$ 49,088
Company product sales
Disaggregation of Revenue [Line Items]
Revenue, net	18,228	16,375	48,591	44,288
Contract manufacturing sales
Disaggregation of Revenue [Line Items]
Revenue, net	167	1,878	1,097	4,626
Research and development services and other income
Disaggregation of Revenue [Line Items]
Revenue, net	71	41	241	174
Topical
Disaggregation of Revenue [Line Items]
Revenue, net	13,271	10,503	35,240	26,297
Injectables
Disaggregation of Revenue [Line Items]
Revenue, net	$ 4,957	$ 5,872	$ 13,351	$ 17,991