Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Concentration Risk (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
U.S. Net Product Sales
Concentration Risk [Line Items]
Concentration of credit risk	96.00%	97.00%
Accounts Receivable
Concentration Risk [Line Items]
Concentration of credit risk		95.00%
Customer A | U.S. Net Product Sales
Concentration Risk [Line Items]
Concentration of credit risk	37.00%	38.00%
Customer A | Accounts Receivable
Concentration Risk [Line Items]
Concentration of credit risk		28.00%
Customer B | U.S. Net Product Sales
Concentration Risk [Line Items]
Concentration of credit risk	33.00%	32.00%
Customer B | Accounts Receivable
Concentration Risk [Line Items]
Concentration of credit risk		34.00%
Customer C | U.S. Net Product Sales
Concentration Risk [Line Items]
Concentration of credit risk	26.00%	27.00%
Customer C | Accounts Receivable
Concentration Risk [Line Items]
Concentration of credit risk		33.00%