Quarterly report pursuant to Section 13 or 15(d)

Concentrations - Additional Information (Detail)

v3.8.0.1
Concentrations - Additional Information (Detail) - Product Concentration Risk - Customer
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Concentration Risk [Line Items]      
Number of customers which represented more than 10% of the Company's accounts receivable 0   0
Sales Revenue, Net      
Concentration Risk [Line Items]      
Number of customers which represented more than 10% of the Company's revenue 0 0  
Concentration Risk Percentage 100.00% 100.00%  
Account Receivable      
Concentration Risk [Line Items]      
Concentration Risk Percentage 10.00%   10.00%
Minimum [Member] | Sales Revenue, Net      
Concentration Risk [Line Items]      
Concentration Risk Percentage 10.00% 10.00%