Annual report pursuant to Section 13 and 15(d)

Research and Development Agreements - Schedule of Condensed Consolidated Balance Sheet (Detail)

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Research and Development Agreements - Schedule of Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
ASSETS      
Other current assets $ 4,424   $ 19
Total assets 140,158   90,391
LIABILITIES AND STOCKHOLDERS’ EQUITY      
Accumulated deficit (94,704)   (64,471)
Total liabilities and stockholders' equity $ 140,158   $ 90,391
ASC 2014-09      
ASSETS      
Other current assets   $ 73  
Total assets   90,445  
LIABILITIES AND STOCKHOLDERS’ EQUITY      
Accumulated deficit   (64,417)  
Total liabilities and stockholders' equity   90,445  
Effect of Adoption of ASC 606 | ASC 2014-09      
ASSETS      
Other current assets   54  
Total assets   54  
LIABILITIES AND STOCKHOLDERS’ EQUITY      
Accumulated deficit   54  
Total liabilities and stockholders' equity   $ 54