Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.8.0.1
Subsequent Events - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended
Nov. 09, 2017
Sep. 30, 2017
Sep. 14, 2017
Dec. 31, 2016
Subsequent Event [Line Items]        
Common stock, shares issued   11,491,665   21,230
LPC [Member]        
Subsequent Event [Line Items]        
Common stock, shares issued   408,947 123,516  
Gross proceeds   $ 1.2    
Common stock available for sale under offering   $ 9.8    
LPC [Member] | Subsequent Event [Member]        
Subsequent Event [Line Items]        
Common stock, shares issued 464,831      
Gross proceeds $ 0.9      
Common stock available for sale under offering $ 8.9