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Subsequent Event - Narrative (Details) - Subsequent event
 1 Months Ended
Oct. 31, 2017
USD ($)
collaborator
collaboration_agreement
Subsequent Event [Line Items]  
Cash consideration $ 25,000,000
Total share consideration $ 10,500,000.0
Number of collaborators | collaborator 3
Threshold of revenues above $15 million with three collaboration agreements  
Subsequent Event [Line Items]  
Revenue royalty to acquiree shareholders (as a percent) 10.00%
Threshold revenue amount to trigger royalty payments $ 15,000,000
Number of collaboration agreements | collaboration_agreement 3
Threshold of revenues above $1.5 million with four collaboration agreements  
Subsequent Event [Line Items]  
Revenue royalty to acquiree shareholders (as a percent) 20.00%
Threshold revenue amount to trigger royalty payments $ 1,500,000.0
Number of collaboration agreements | collaboration_agreement 4