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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) Customer | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) Customer Segment | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) Customer | Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Description of payment of customer invoice contract |  |  | The Company invoices its customers based upon the terms in the contracts, which generally requires payment 30 to 60 days from the date of invoice. |  |  |
Contract asset | $ 0 |  | $ 0 |  | $ 0 |
Revenue recognized, that were included in deferred product revenue |  |  | $ 500,000 |  |  |
Application of an optional exemption not to disclose the value of unsatisfied performance obligations |  |  | true |  |  |
Number of major customers representing outstanding trade receivables | Customer | 2 |  | 2 |  | 2 |
Protracted length of inventory |  |  | 1 year |  |  |
Inventory valuation reserves | $ 100,000 |  | $ 100,000 |  | $ 300,000 |
Non-cash purchases of capital expenditures |  |  | 2,900,000 | $ 900,000 |  |
Accumulated amortization intangible assets | 1,800,000 |  | $ 1,800,000 |  | 1,700,000 |
Estimated useful life of intangible assets |  |  | 10 years |  |  |
Number of reportable segments | Segment |  |  | 1 |  |  |
Impairment charges acquired intangible assets | 0 | $ 0 | $ 0 | $ 0 |  |
Period of warranty |  |  | 1 year |  |  |
Warranty claim liability | 0 |  | $ 0 |  | $ 0 |
Operating lease right-of-use assets | 14,110,000 |  | 14,110,000 |  |  |
Operating lease liabilities – current | 1,592,000 |  | 1,592,000 |  |  |
Operating lease liabilities – non-current | $ 18,458,000 |  | $ 18,458,000 |  |  |
ASU 2016-02 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  | $ 2,400,000
Operating lease liabilities – current |  |  |  |  |  | 2,400,000
Operating lease liabilities – non-current |  |  |  |  |  | $ 2,400,000
Trade Accounts Receivable | Customer Concentration Risk |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration risk, percentage |  |  | 47.00% |  | 50.00% |
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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