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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) Customer Segment | Mar. 31, 2018 USD ($) | 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 is generally from 30 to 60 days. |  |  |
Contract asset | $ 0 |  | $ 0 |
Revenue recognized, that were included in deferred product revenue | $ 200,000 |  |  |
Application of an optional exemption not to disclose the value of unsatisfied performance obligations | true |  |  |
Number of major customers representing outstanding trade receivables | Customer | 3 |  | 2 |
Protracted length of inventory | 1 year |  |  |
Inventory valuation reserves | $ 400,000 |  | $ 300,000 |
Accumulated amortization intangible assets | $ 1,700,000 |  | 1,700,000 |
Estimated useful life of intangible assets | 10 years |  |  |
Number of reportable segments | Segment | 1 |  |  |
Impairment charges acquired intangible asstes | $ 0 | $ 0 |  |
Period of warranty | 1 year |  |  |
Warranty claim liability | $ 0 |  | $ 0 |
Operating lease right-of-use assets | 15,631,000 |  |  |
Operating lease liabilities – current | 1,560,000 |  |  |
Operating lease liabilities – non-current | $ 19,311,000 |  |  |
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 | 59.00% |  | 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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