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Revenue Recognition - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 01, 2020	Feb. 01, 2019
Disaggregation Of Revenue [Line Items]
Revenue remaining unsatisfied performance obligation	$ 0
Payment term for customers	120 days
Subsequent Event
Disaggregation Of Revenue [Line Items]
Maximum amount of reduction in monthly co-payments of each prescription		$ 100
Maximum
Disaggregation Of Revenue [Line Items]
Amount of reduction patients could receive from cost of co-payments of first month of therapy			$ 300
Amount of reduction from the cost of each refill for maximum of 12 months			$ 250

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045

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