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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2019 USD ($) Customer Segment | Dec. 31, 2018 USD ($) Customer | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($)
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 |  |
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 | 3 | 2 |  |
Protracted length of inventory | 1 year |  |  |
Inventory valuation reserves | $ 100,000 | $ 300,000 |  |
Accumulated amortization intangible assets | $ 1,900,000 | 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 |
Period of warranty | 1 year |  |  |
Warranty claim liability | $ 0 | 0 |  |
Operating lease right-of-use assets | 14,122,000 |  |  |
Operating lease liabilities – current | 1,613,000 |  |  |
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
Leasehold Improvements |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Capitalized construction-in-progress costs | 0 | 6,900,000 |  |
Prepaid and Other Current Assets |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Receivables related to office building | $ 0 | $ 1,200,000 |  |
Trade Accounts Receivable | Customer Concentration Risk |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk, percentage | 56.00% | 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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