Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.19.1
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2019
Mar. 31, 2019
Mar. 31, 2018
Significant Accounting Policies [Line Items]      
Additional operating lease assets   $ (331) $ 0
Additional operating lease liabilities   $ (261) $ 0
Accounting Standards Update 2016-02      
Significant Accounting Policies [Line Items]      
Additional operating lease assets $ 14,300    
Additional operating lease liabilities 15,300    
Corresponding lease obligation 10,300    
Cumulative effect adjustment to opening balance of accumulated deficit, expected decrease $ 400