Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Net product revenue	$ 135,674	$ 83,433	$ 251,854	$ 120,531
Basic net income per share	$ 0.83	$ 0.34	$ 1.33	$ 0.05
Earnings Per Share Diluted	$ 0.70	$ 0.32	$ 1.20	$ 0.05
Commercial payer invoices
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Refund Received	$ 7,500
Commercial payer invoices | Restatement Adjustment [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Accrued rebates	(5,800)		$ (5,800)
Net product revenue	$ 13,300		$ 13,300
Basic net income per share	$ 0.19
Earnings Per Share Diluted	$ 0.15		$ 0.16
Accrued rebates, fees and reserve | Commercial payer invoices
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Accrued rebates	$ 21,600		$ 21,600		$ 14,000