Summary of Significant Accounting Policies - Concentrations (Details) - item	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Total net revenue | Customer 1
Concentrations
Concentration risk (as a percentage)	96.00%	68.00%
Total net revenue | Customer 2
Concentrations
Concentration risk (as a percentage)		30.00%
Total net revenue | Customer 3
Concentrations
Concentration risk (as a percentage)	96.00%	98.00%
Total net revenue | Customer risk | One major pharmaceutical distributors
Concentrations
Number of major distributors	1
Total net revenue | Customer risk | Three major pharmaceutical distributors
Concentrations
Number of major distributors	3
Total net revenue | Customer risk | Three major pharmaceutical distributors | Minimum
Concentrations
Concentration risk (as a percentage)	10.00%
Total accounts receivable
Concentrations
Concentration risk (as a percentage)	99.00%	99.00%
Total accounts receivable | Customer 1
Concentrations
Concentration risk (as a percentage)	99.00%	99.00%