Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Detail)

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Related Party Transactions - Additional Information (Detail)
3 Months Ended
Jan. 05, 2017
USD ($)
ExecutiveOfficers
May 12, 2016
shares
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Related Party Transaction [Line Items]          
Guaranteed borrowing capacity     $ 10,000,000    
Common stock issued during the period, value     3,600,000    
Related party notes payable     $ 1,200,000   $ 1,000,000
Chief Executive Officer          
Related Party Transaction [Line Items]          
Common stock issued during the period | shares     850,000    
Chief Financial Officer          
Related Party Transaction [Line Items]          
Common stock issued during the period | shares     150,000    
Chief Executive Officer and Chief Financial Officer          
Related Party Transaction [Line Items]          
Common stock issued during the period, value     $ 3,600,000    
Aston Capital Limited Liability Company          
Related Party Transaction [Line Items]          
Interest rate of debt     9.00% 9.00%  
Related party notes payable     $ 200,000 $ 1,500,000  
Amount due to related party     1,200,000 1,000,000  
Number of new executives | ExecutiveOfficers 2        
Executive compensation cost $ 0        
Annual payment for underlying lease     100,000 100,000  
Aston Capital Limited Liability Company | Restricted Stock          
Related Party Transaction [Line Items]          
Number of shares authorized for grant | shares   250,000      
Stock awards vesting periods   3 years      
Aston Capital Limited Liability Company | Promissory Notes          
Related Party Transaction [Line Items]          
Debt instrument amount     $ 11,700,000 $ 11,700,000  
Interest rate of debt     9.00% 9.00%  
Debt instrument maturity date     Apr. 01, 2019    
Accrued interest     $ 400,000   $ 100,000
Interest Expenses     $ 300,000    
Aston Capital Limited Liability Company | Promissory Notes | Maximum          
Related Party Transaction [Line Items]          
Interest Expenses       $ 100,000