Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net Revenue	$ 15,280	$ 15,407	$ 47,033	$ 45,812
Drug products
Disaggregation of Revenue [Line Items]
Net Revenue	284	166	776	317
Concentrate Products
Disaggregation of Revenue [Line Items]
Net Revenue	14,996	15,241	46,257	45,495
U.S.
Disaggregation of Revenue [Line Items]
Net Revenue	14,188	13,946	42,375	40,697
U.S. | Drug products
Disaggregation of Revenue [Line Items]
Net Revenue	228	98	609	112
U.S. | Concentrate Products
Disaggregation of Revenue [Line Items]
Net Revenue	13,960	13,848	41,766	40,585
Rest of World
Disaggregation of Revenue [Line Items]
Net Revenue	1,092	1,461	4,658	5,115
Rest of World | Drug products
Disaggregation of Revenue [Line Items]
Net Revenue	56	68	167	205
Rest of World | Concentrate Products
Disaggregation of Revenue [Line Items]
Net Revenue	1,036	1,393	4,491	4,910
Product Sales – Point-in-time | Drug product sales
Disaggregation of Revenue [Line Items]
Net Revenue	228	98	609	112
Product Sales – Point-in-time | Concentrate product sales
Disaggregation of Revenue [Line Items]
Net Revenue	14,506	14,746	44,786	44,010
Product Sales – Point-in-time | U.S. | Drug product sales
Disaggregation of Revenue [Line Items]
Net Revenue	228	98	609	112
Product Sales – Point-in-time | U.S. | Concentrate product sales
Disaggregation of Revenue [Line Items]
Net Revenue	13,470	13,353	40,295	39,100
Product Sales – Point-in-time | Rest of World | Drug product sales
Disaggregation of Revenue [Line Items]
Net Revenue	0	0	0	0
Product Sales – Point-in-time | Rest of World | Concentrate product sales
Disaggregation of Revenue [Line Items]
Net Revenue	1,036	1,393	4,491	4,910
License Fee – Over time | Drug license fee
Disaggregation of Revenue [Line Items]
Net Revenue	56	68	167	205
License Fee – Over time | Concentrate product license fee
Disaggregation of Revenue [Line Items]
Net Revenue	490	495	1,471	1,485
License Fee – Over time | U.S. | Drug license fee
Disaggregation of Revenue [Line Items]
Net Revenue	0	0	0	0
License Fee – Over time | U.S. | Concentrate product license fee
Disaggregation of Revenue [Line Items]
Net Revenue	490	495	1,471	1,485
License Fee – Over time | Rest of World | Drug license fee
Disaggregation of Revenue [Line Items]
Net Revenue	56	68	167	205
License Fee – Over time | Rest of World | Concentrate product license fee
Disaggregation of Revenue [Line Items]
Net Revenue	$ 0	$ 0	$ 0	$ 0