Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Net revenue	$ 15,895,971	$ 14,845,788	$ 31,752,510	$ 30,405,227
Drug Products
Disaggregation of Revenue [Line Items]
Net revenue	238,000	83,000	493,000	151,000
Concentrate Products
Disaggregation of Revenue [Line Items]
Net revenue	15,658,000	14,763,000	31,260,000	30,254,000
United States
Disaggregation of Revenue [Line Items]
Net revenue	13,991,000	13,332,000	28,187,000	26,751,000
United States | Drug Products
Disaggregation of Revenue [Line Items]
Net revenue	182,000	15,000	381,000	15,000
United States | Concentrate Products
Disaggregation of Revenue [Line Items]
Net revenue	13,809,000	13,317,000	27,806,000	26,736,000
Rest of World
Disaggregation of Revenue [Line Items]
Net revenue	1,905,000	1,514,000	3,566,000	3,654,000
Rest of World | Drug Products
Disaggregation of Revenue [Line Items]
Net revenue	56,000	68,000	112,000	136,000
Rest of World | Concentrate Products
Disaggregation of Revenue [Line Items]
Net revenue	1,849,000	1,446,000	3,454,000	3,518,000
Point-in-time | Drug Product Sales
Disaggregation of Revenue [Line Items]
Net revenue	182,000	15,000	381,000	15,000
Point-in-time | Concentrate Product Sales
Disaggregation of Revenue [Line Items]
Net revenue	15,168,000	14,268,000	30,280,000	29,264,000
Point-in-time | United States | Drug Product Sales
Disaggregation of Revenue [Line Items]
Net revenue	182,000	15,000	381,000	15,000
Point-in-time | United States | Concentrate Product Sales
Disaggregation of Revenue [Line Items]
Net revenue	13,319,000	12,822,000	26,826,000	25,746,000
Point-in-time | Rest of World | Drug Product Sales
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
Point-in-time | Rest of World | Concentrate Product Sales
Disaggregation of Revenue [Line Items]
Net revenue	1,849,000	1,446,000	3,454,000	3,518,000
Over time | Drug License Fee
Disaggregation of Revenue [Line Items]
Net revenue	56,000	68,000	112,000	136,000
Over time | Concentrate Product License Fee
Disaggregation of Revenue [Line Items]
Net revenue	490,000	495,000	980,000	990,000
Over time | United States | Drug License Fee
Disaggregation of Revenue [Line Items]
Net revenue	0	0	0	0
Over time | United States | Concentrate Product License Fee
Disaggregation of Revenue [Line Items]
Net revenue	490,000	495,000	980,000	990,000
Over time | Rest of World | Drug License Fee
Disaggregation of Revenue [Line Items]
Net revenue	56,000	68,000	112,000	136,000
Over time | Rest of World | Concentrate Product License Fee
Disaggregation of Revenue [Line Items]
Net revenue	$ 0	$ 0	$ 0	$ 0