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Nature of Business and Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Segments
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Nature Of Business And Significant Accounting Policies [Line Items]                      
Net loss attributable to common shareholders $ (14,393,000) $ (20,847,000) $ (9,220,000) $ (7,826,000) $ (4,446,000) $ (8,832,000) $ (17,415,000) $ (8,981,000) $ (52,286,000) $ (39,674,000) $ (43,413,000)
Cash and cash equivalents 12,600,000               12,600,000    
Working capital 46,800,000               $ 46,800,000    
Number of reportable segments | Segments                 1    
Maturity period of cash and cash equivalents                 3 months    
Rental assets, net 6,155,000       0       $ 6,155,000 0  
Less—accumulated depreciation and amortization 62,832,000       $ 68,449,000       62,832,000 68,449,000  
Intangible assets impairment                 0 0 0
Long-lived assets impairment                 $ 27,000 $ 0 $ 70,000
Developed technologies                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Intangible assets useful lives                 5 years    
Trademarks and trade names                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Intangible assets useful lives                 10 years    
Rental Assets                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Rental assets, net 6,200,000               $ 6,200,000    
Less—accumulated depreciation and amortization $ 1,000,000               $ 1,000,000    
Software and Software Development Costs                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Property, plant and equipment useful lives                 5 years    
Minimum                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Property, plant and equipment useful lives                 18 months    
General warranty period                 1 year    
Minimum | Licensing fees                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Intangible assets useful lives                 1 year    
Minimum | Developed technologies                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Intangible assets useful lives                 5 years    
Minimum | Customer relationships                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Intangible assets useful lives                 5 years    
Minimum | Rental Assets                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Property, plant and equipment useful lives                 3 years    
Maximum                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Property, plant and equipment useful lives                 6 years    
General warranty period                 3 years    
Maximum | Licensing fees                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Intangible assets useful lives                 3 years    
Maximum | Developed technologies                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Intangible assets useful lives                 8 years    
Maximum | Customer relationships                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Intangible assets useful lives                 10 years    
Maximum | Buildings                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Property, plant and equipment useful lives                 50 years    
Maximum | Rental Assets                      
Nature Of Business And Significant Accounting Policies [Line Items]                      
Property, plant and equipment useful lives                 4 years