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Nature of Business and Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Segments
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Nature Of Business And Significant Accounting Policies [Line Items]                      
Net loss attributable to common shareholders $ (27,401,000) $ (18,567,000) $ (2,701,000) $ (11,904,000) $ (14,393,000) $ (20,847,000) $ (9,220,000) $ (7,826,000) $ (60,573,000) $ (52,286,000) $ (39,674,000)
Cash and cash equivalents 9,900,000               9,900,000    
Working capital $ 6,100,000               $ 6,100,000    
Number of reportable segments | Segments                 1    
Impairment of indefinite-lived intangible assets                 $ 0 0 0
Long-lived assets impairment                 $ 2,700,000 $ 27,000 $ 0
Internal Use Software                      
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 | 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 | 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