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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2013
Customer
Dec. 31, 2012
Customer
Dec. 31, 2011
Dec. 31, 2012
Product Warranty
Aug. 31, 2009
2009 Unit Offering
Warrant
Nov. 30, 2010
2010 Unit Offering
Warrant
Dec. 31, 2013
Trade Accounts Receivable
Dec. 31, 2012
Trade Accounts Receivable
Dec. 31, 2013
Maximum
Dec. 31, 2013
Minimum
Summary Of Significant Accounting Policies [Line Items]                      
Deferred revenue   $ 181,000 $ 77,000                
Revenue from government grants 91,000 0 91,000 2,442,000              
Number of major customers representing outstanding trade receivables   2 3                
Cumulative outstanding trade receivables percentage by major customers               48.00% 59.00%    
Life of inventory   2 years                  
Protracted length of inventory   1 year                  
Inventory valuation reserves   400,000 300,000                
Unsalable product having offsetting warranty claim     1,700,000                
Estimated useful life of property and equipment                   5 years 3 years
Estimated useful life of intangible assets   10 years                  
Impairment charges on long-lived assets   0 0 0              
Foreign currency gains (losses)   533,000 86,000 (529,000)              
Warrants to purchase an aggregate shares of common stock           2.4 3.7        
Derecognition of tax positions, Maximum                   50.00%  
Company's tax years subject to examination by the taxing jurisdictions                   2013 1998
Unrecognized Tax Benefits   0 0                
Period of warranty   1 year                  
Warrants obligation provided     900,000                
Warranty claim   442,000 2,038,000   1,800,000            
Inventory write down     $ 1,700,000