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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) Customer | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Customer Segment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Description of payment of customer invoice contract |  |  | The Company invoices its customers based upon the payment terms in the contracts, which is generally from 30 to 60 days. |  |
Contract asset | $ 0 |  | $ 0 |  | $ 0
Revenue recognized, that were included in deferred product revenue |  |  | $ 300,000 |  |
Application of an optional exemption not to disclose the value of unsatisfied performance obligations |  |  | true |  |
Restricted cash | $ 2,500,000 |  | $ 2,500,000 |  |
Number of major customers representing outstanding trade receivables | Customer | 2 |  | 2 |  | 3
Protracted length of inventory |  |  | 1 year |  |
Inventory valuation reserves | $ 300,000 |  | $ 300,000 |  | $ 100,000
Capitalized construction-in-progress cost unpaid |  |  | 800,000 |  |
Accumulated amortization intangible assets | 1,600,000 |  | $ 1,600,000 |  | 1,500,000
Estimated useful life of intangible assets |  |  | 10 years |  |
Number of reportable segments | Segment |  |  | 1 |  |
Impairment charges acquired intangible asstes | 0 | $ 0 | $ 0 | $ 0 |
Period of warranty |  |  | 1 year |  |
Warranty claim liability | 0 |  | $ 0 |  | 0
Leasehold Improvements |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Capitalized construction-in-progress costs | $ 1,500,000 |  | $ 1,500,000 |  | $ 0
Trade Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 61.00% |  | 53.00%
Minimum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Payment of customer invoice contract period |  |  | 30 days |  |
Shelf lives of inventory |  |  | 18 months |  |
Estimated useful life of property and equipment |  |  | 3 years |  |
Maximum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Payment of customer invoice contract period |  |  | 60 days |  |
Shelf lives of inventory |  |  | 24 months |  |
Estimated useful life of property and equipment |  |  | 5 years |  |

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