XML 43 R30.htm IDEA: XBRL DOCUMENT v3.7.0.1
Summary of Significant Accounting Policies - Additional Information (Detail)
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Customer
Segment
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Customer
Summary Of Significant Accounting Policies [Line Items]      
Number of major customers representing outstanding trade receivables | Customer 3   3
Life of inventory 2 years    
Protracted length of inventory 1 year    
Inventory valuation reserves $ 200,000   $ 200,000
Estimated useful life of intangible assets 10 years    
Number of reportable segments | Segment 1    
Impairment charges on long-lived assets $ 0 $ 0  
Period of warranty 1 year    
Warranty claim liability $ 0   $ 0
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life of property and equipment 3 years    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life of property and equipment 5 years    
Trade Accounts Receivable | Customer Concentration Risk      
Summary Of Significant Accounting Policies [Line Items]      
Concentration risk, percentage 39.00%   46.00%