Quarterly report pursuant to Section 13 or 15(d)

Mandatorily-Redeemable Preferred Stock (Detail)

v3.5.0.2
Mandatorily-Redeemable Preferred Stock (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Aug. 17, 2016
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Subsidiary, Sale of Stock [Line Items]        
Proceeds from issuance of mandatorily-redeemable preferred stock     $ 28,750,000 $ 0
Proceeds from issuance of equity     $ 360,472 14,895,206
Redemption price of redeemable preferred stock (in dollars per share)   $ 25.8 $ 25.8  
Offering costs     $ 241,845 $ 1,027,986
Term preferred stock, fair value   $ 29,700,000 $ 29,700,000  
Series A Preferred Stock [Member]        
Subsidiary, Sale of Stock [Line Items]        
Number of shares issued (in shares) 1,000,000   1,150,000  
Preferred stock, dividend rate, percentage 6.375%      
Preferred stock, par value (in dollars per share) $ 0.001      
Public offering price (in dollars per share) $ 25      
Proceeds from issuance of equity $ 27,600,000      
Redemption price of redeemable preferred stock (in dollars per share) $ 25      
Offering costs $ 1,200,000      
Dividend per Series A Term Preferred Share (in dollars per share)   $ 0.190364583    
Series A Preferred Stock [Member] | Over-Allotment Option [Member]        
Subsidiary, Sale of Stock [Line Items]        
Number of shares issued (in shares) 150,000