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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Customer
Jun. 30, 2013
Jun. 30, 2014
Segment
Customer
Jun. 30, 2013
Dec. 31, 2013
Customer
Aug. 31, 2009
2009 Unit Offering
Nov. 30, 2010
2010 Unit Offering
Jun. 30, 2014
Trade Accounts Receivable
Dec. 31, 2013
Trade Accounts Receivable
Jun. 30, 2014
Minimum
Jun. 30, 2014
Maximum
Jun. 30, 2013
Maximum
Jun. 30, 2014
Maximum
Jun. 30, 2013
Maximum
Summary Of Significant Accounting Policies [Line Items]                            
Number of major customers representing outstanding trade receivables 3   3   2                  
Cumulative outstanding trade receivables percentage by major customers               65.00% 55.00%          
Life of inventory     2 years                      
Protracted length of inventory     1 year                      
Inventory valuation reserves $ 0.1   $ 0.1   $ 0.4                  
Estimated useful life of property and equipment                   3 years     5 years  
Capitalized costs for enhancement of enterprise resource planning software system and other internal use software 1.2 0 1.2 0                    
Estimated useful life of intangible assets     10 years                      
Number of operating segments     1                      
Number of reportable segments     1                      
Impairment charges on long-lived assets 0 0 0 0                    
Foreign exchange losses                     $ (0.2) $ (0.2) $ (0.2) $ (0.2)
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                   1998     2013  
Period of warranty     1 year