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Acquisitions - Schedule of Purchase Price Consideration Allocation (Detail) - USD ($)
$ in Thousands
Jul. 19, 2017
Dec. 31, 2017
Business Combinations [Abstract]    
Fair value of shares issued $ 20,625  
Unamortized fair value of Cerulean options 3,654  
Fair value of total consideration 24,279  
Assets acquired and liabilities assumed    
Cash and cash equivalents 9,918  
Prepaid expense and other current assets 1,915  
Accounts payable (233)  
Total assets acquired and liabilities assumed 11,600  
Goodwill $ 12,679 $ 5,200