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Summary of Significant Accounting Policies - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Customer
Sep. 30, 2014
USD ($)
Customer
Sep. 30, 2015
USD ($)
Customer
Business
Sep. 30, 2014
USD ($)
Customer
Dec. 31, 2014
USD ($)
Customer
Summary Of Significant Accounting Policies [Line Items]          
Number of business activities | Business     1    
Cash held in foreign banks $ 3,400,000   $ 3,400,000   $ 4,300,000
Revenues 15,402,000 $ 8,668,000 36,482,000 $ 22,858,000  
Money market funds 22,400,000   22,400,000   10,600,000
Restricted cash 906,000   906,000   300,000
Write down of inventory 500,000 200,000 $ 2,071,000 457,000  
Standard product warranty, Description     Limited one- to five-year warranty    
Impairment charges     $ 0    
Provision for income taxes 269,000 137,000 566,000 374,000  
United States [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Revenues 4,500,000        
Letter of Credit [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Restricted cash 600,000   600,000    
Inventory Valuation and Obsolescence [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Write down of inventory 300,000 0 1,600,000 0  
Certificate of Deposit [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Restricted cash 300,000   300,000   $ 300,000
Foreign Tax Authority [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Provision for income taxes $ 0 $ 0 $ 0 $ 0  
Minimum [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful life of property and equipment     3 years    
Maximum [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Estimated useful life of property and equipment     5 years    
Customer Concentration Risk [Member] | Revenue [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Number of customers accounted more than 10% concentration risk | Customer 0   0    
Customer Concentration Risk [Member] | Minimum Threshold For Disclosure [Member] | Revenue [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk, percentage 10.00% 10.00% 10.00% 10.00%  
Number of customers accounted more than 10% concentration risk | Customer   0   0  
Credit Concentration Risk [Member] | Accounts Receivable [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Number of customers accounted more than 10% concentration risk | Customer     0   0
Credit Concentration Risk [Member] | Minimum Threshold For Disclosure [Member] | Accounts Receivable [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Concentration risk, percentage     10.00%   10.00%