Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event - Additional Information (Detail)

v3.19.2
Subsequent Event - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Jul. 18, 2019
Jul. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Subsequent Event [Line Items]        
Proceeds from sale of common stock, net     $ 7,630 $ 47,586
Subsequent Event | Underwritten Public Offering        
Subsequent Event [Line Items]        
Common stock, shares issued   6,871,727    
Shares issued, price per share   $ 15.28    
Number of options to purchase common shares of stock granted 1,472,512      
Option price to purchase shares $ 15.28      
Proceeds from sale of common stock, gross   $ 150,000    
Proceeds from sale of common stock, net   $ 140,600    
Subsequent Event | Underwritten Public Offering | Warrant        
Subsequent Event [Line Items]        
Number of securities called by warrants   2,945,026    
Warrant, price per share   $ 15.2799    
Number of securities called by each warrant   1    
Warrants, exercise price   $ 0.0001    
Warrants, term   7 years