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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) Customer | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) Customer Segment | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of major customers representing outstanding trade receivables | Customer | 3 |  | 3 |  | 3
Life of inventory |  |  | 2 years |  |
Protracted length of inventory |  |  | 1 year |  |
Inventory valuation reserves | $ 200,000 |  | $ 200,000 |  | $ 200,000
Estimated useful life of intangible assets |  |  | 10 years |  |
Number of reportable segments | Segment |  |  | 1 |  |
Impairment charges on long-lived assets | 0 | $ 0 | $ 0 | $ 0 |
Period of warranty |  |  | 1 year |  |
Warranty claim liability | $ 0 |  | $ 0 |  | $ 0
Minimum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life of property and equipment |  |  | 3 years |  |
Maximum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life of property and equipment |  |  | 5 years |  |
Trade Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 46.00% |  | 46.00%

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