Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.2.0.727
Subsequent Events - Additional Information (Detail) - USD ($)
$ in Millions
 1 Months Ended 2 Months Ended
Aug. 13, 2015
Jun. 30, 2015
Apr. 30, 2015
Dec. 31, 2014
Subsequent Event [Line Items]        
Common stock, shares issued   24,467,727   22,630,652
Common stock available for sale under offering   $ 14.7    
LPC [Member]        
Subsequent Event [Line Items]        
Common stock, shares issued   500,000 126,582  
Gross proceeds   $ 1.3    
Offering expenses   $ 0.1    
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Common stock available for sale under offering $ 0.0      
Subsequent Event [Member] | LPC [Member]        
Subsequent Event [Line Items]        
Common stock, shares issued 5,358,042      
Gross proceeds $ 14.7      
Offering expenses $ 0.3