Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	9 Months Ended
Sep. 30, 2018 Customer	Sep. 30, 2018 Supplier Customer
Andexxa Specialty Distributor \| Customer Concentration Risk \| Sales Revenue, Net
Summary Of Significant Accounting Policies [Line Items]
Number of customer \| Customer	3	3
Andexxa Specialty Distributor \| Customer Concentration Risk \| Sales Revenue, Net \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage	10.00%	10.00%
Andexxa
Summary Of Significant Accounting Policies [Line Items]
Number of suppliers		1
Bevyxxa
Summary Of Significant Accounting Policies [Line Items]
Number of suppliers		1

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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