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Summary of Significant Accounting Policies - Schedule of Impact of Adoption of ASC 842 (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Operating lease right-of-use assets, net $ 6,060    
Property and equipment, net 295   $ 7,290
Construction financing liability     5,342
Operating lease liabilities, current 446    
Operating lease liabilities, net of current portion 4,586    
Accumulated deficit $ (198,135)   (168,493)
Prior to ASC 842 Adoption [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Property and equipment, net     7,290
Construction financing liability     5,342
Other liabilities, current     3,639
Accumulated deficit     $ (168,493)
ASU No. 2016-02 [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Operating lease right-of-use assets, net   $ 6,697  
Property and equipment, net   292  
Other liabilities, current   3,552  
Operating lease liabilities, current   334  
Operating lease liabilities, net of current portion   5,067  
Accumulated deficit   (168,766)  
ASU No. 2016-02 [Member] | ASC 842 Adjustment [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Operating lease right-of-use assets, net   6,697  
Property and equipment, net   (6,998)  
Construction financing liability   (5,342)  
Other liabilities, current   (87)  
Operating lease liabilities, current   334  
Operating lease liabilities, net of current portion   5,067  
Accumulated deficit   $ (273)