Summary of Significant Accounting Policies (Schedule of Concentration Risk) (Details)	12 Months Ended
	Dec. 31, 2019
U.S. Net Product Sales
Concentration Risk [Line Items]
Concentration risk	95.00%
As of December 31, 2019
Concentration Risk [Line Items]
Concentration risk	100.00%
Customer A | U.S. Net Product Sales
Concentration Risk [Line Items]
Concentration risk	34.00%
Customer A | As of December 31, 2019
Concentration Risk [Line Items]
Concentration risk	28.00%
Customer B | U.S. Net Product Sales
Concentration Risk [Line Items]
Concentration risk	31.00%
Customer B | As of December 31, 2019
Concentration Risk [Line Items]
Concentration risk	39.00%
Customer C | U.S. Net Product Sales
Concentration Risk [Line Items]
Concentration risk	30.00%
Customer C | As of December 31, 2019
Concentration Risk [Line Items]
Concentration risk	33.00%