Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event - Additional Information (Detail)

v3.10.0.1
Subsequent Event - Additional Information (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jul. 17, 2018
Apr. 06, 2018
Jun. 30, 2018
Dec. 31, 2017
Subsequent Event [Line Items]        
Exercise price of each warrant   $ 2.00    
Common shares issued during public offering   900,000    
Allotment upon exercise of underwriters option ,shares     0 0
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Proceeds from public offering $ 13,800,000      
Allotment upon exercise of underwriters option ,shares 13,800,000      
Increase decrease in common stock 4.99%      
Notice Period 61 days      
Subsequent Event [Member] | Common Stock [Member]        
Subsequent Event [Line Items]        
Share price per unit $ 3.00      
Common shares issued during public offering 4,436,000      
Conversion price $ 1.00      
Trading period 30 days      
Average trading volume for measurement $ 175,000      
Subsequent Event [Member] | Warrant [Member]        
Subsequent Event [Line Items]        
Proceeds from public offering $ 12,300,000      
Subsequent Event [Member] | Capital Unit, Class A [Member]        
Subsequent Event [Line Items]        
Share price per unit $ 1.00      
Number of common stock consist in each unit 1      
Number of warrant consist in each unit 1      
Common stock warrants term 7 years      
Exercise price of each warrant $ 1.00      
Subsequent Event [Member] | Capital Unit, Class B [Member]        
Subsequent Event [Line Items]        
Share price per unit $ 1      
Subsequent Event [Member] | Maximum [Member]        
Subsequent Event [Line Items]        
Increase decrease in common stock 9.99%      
Subsequent Event [Member] | Underwriter [Member]        
Subsequent Event [Line Items]        
Allotment upon exercise of underwriters option ,shares 1,800,000      
Subsequent Event [Member] | Series D Preferred Stock [Member]        
Subsequent Event [Line Items]        
Total preferred stock issued 9,364,000      
Preferred stock, shares outstanding 8,760,000      
Subsequent Event [Member] | Series D Preferred Stock [Member] | Capital Unit, Class B [Member]        
Subsequent Event [Line Items]        
Number of preferred stock consist in each unit 1      
Preferred stock convertible into common stock,warrants 1