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Nature of Business and Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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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 |  |

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