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Helsinn License Agreement - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Aug. 16, 2016
Aug. 05, 2016
Mar. 31, 2017
Mar. 31, 2017
Aug. 31, 2016
Related Party Transaction [Line Items]          
License revenue     $ 3,779,000 $ 20,880,000  
Potential Regulatory and Sales-Based Milestone Payment | Maximum          
Related Party Transaction [Line Items]          
Milestone payment receivable amount         $ 444,000,000
Helsinn License Agreement | Helsinn | Up Front Payment          
Related Party Transaction [Line Items]          
Compensation receivable for grant of rights         $ 15,000,000
Helsinn License Agreement | Helsinn | Balance Payment          
Related Party Transaction [Line Items]          
Compensation receivable for grant of rights     $ 5,000,000 $ 5,000,000  
Helsinn Equity Agreement | Helsinn Investment Fund SA          
Related Party Transaction [Line Items]          
Proceeds from sale of equity method investment   $ 5,000,000      
Volume weighted average price period   10 days      
Volume weighted average price period beginning date   Aug. 01, 2016      
Volume weighted average price period ending date   Aug. 12, 2016      
Sale of stock, number of common stock issued 2,616,431        
Sale of common stock, price per share   $ 1.911      
Closing price of common stock   $ 1.61      
Revenue recognized   $ 800,000