Quarterly report pursuant to Section 13 or 15(d)

Merger with Private Molecular - Summary of Allocation of Purchase Consideration to Assets Acquired and Liabilities Assumed (Detail)

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Merger with Private Molecular - Summary of Allocation of Purchase Consideration to Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Aug. 01, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 3,314   $ 0
Threshold      
Business Acquisition [Line Items]      
Cash and cash equivalents   $ 11,216  
Prepaid expenses and other current assets   945  
Goodwill   3,314  
Accounts payable, accrued expenses   (1,990)  
Warrant liability   (1,121)  
Net assets acquired   39,664  
Threshold | In-process Research and Development (IPR&D)      
Business Acquisition [Line Items]      
In-process research and development (IPR&D)   $ 27,300