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Summary of Significant Accounting Policies - Schedule of Impact of Adoption of New Leasing Standard (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Significant Accounting Policies [Line Items]    
Operating lease right-of-use assets, net $ 14,147 $ 472
Property and equipment, net 648 424
Operating lease liabilities, current 1,033 559
Accumulated deficit $ (260,635) (216,808)
As Previously Reported [Member] | ASU 2016-02 [Member]    
Significant Accounting Policies [Line Items]    
Property and equipment, net   16,567
Deferred rent, current   87
Other liabilities, current   902
Other liabilities, net of current   15,315
Accumulated deficit   (216,882)
New Lease Standard Adjustment [Member] | ASU 2016-02 [Member]    
Significant Accounting Policies [Line Items]    
Operating lease right-of-use assets, net   472
Property and equipment, net   (16,143)
Deferred rent, current   (87)
Operating lease liabilities, current   559
Other liabilities, current   (902)
Other liabilities, net of current   (15,315)
Accumulated deficit   $ 74