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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) Customer Segment | Dec. 31, 2016 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items] |  |
Deferred revenue-current | $ 445,000 | $ 149,000
Number of major customers representing outstanding trade receivables | Customer | 3 | 3
Protracted length of inventory | 1 year |
Inventory valuation reserves | $ 100,000 | $ 100,000
Estimated useful life of intangible assets | 10 years |
Number of reportable segments | Segment | 1 |
Period of warranty | 1 year |
Warranty claim liability | $ 0 | $ 0
Trade Accounts Receivable | Customer Concentration Risk |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Concentration risk, percentage | 53.00% | 46.00%
Maximum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Long-term deferred revenue | $ 100,000 | $ 100,000
Shelf lives of inventory | 24 months |
Estimated useful life of property and equipment | 5 years |
Minimum |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Shelf lives of inventory | 18 months |
Estimated useful life of property and equipment | 3 years |

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