Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies - Additional Information (Detail)

v3.19.1
Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Organization And Summary Of Significant Accounting Policies [Line Items]          
Right-of-use asset $ 11,131   $ 7,200 $ 4,180 $ 0
Lease liabilities 11,735   $ 7,200    
Accounts receivable 295       $ 240
Takeda Pharmaceuticals Inc          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Accounts receivable $ 300        
Revenue | Credit Risk          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Percentage of total revenues 92.00% 34.00%      
ASU 2016-02          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Right-of-use asset       4,180  
Lease liabilities       $ 4,700