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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 USD ($) | Dec. 31, 2018 Customer | Dec. 31, 2017 USD ($) Customer
Schedule Of Accounting Policies [Line Items] |  |  |
Refinancing of outstanding loans used as working capital |  |  | $ 1,000
Estimated liquidity period |  | 12 months |
ASU 2016-02 | Minimum | Subsequent Event |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Increase to assets and liabilities | $ 600 |  |
ASU 2016-02 | Maximum | Subsequent Event |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Increase to assets and liabilities | $ 800 |  |
Customer Concentration Risk | Net Revenue |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Number of Customers | Customer |  | 2 | 0
Customer accountability percentage |  | 23.00% |
Credit Concentration Risk | Net Accounts Receivable-Trade |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Number of Customers | Customer |  | 2 | 3
Customer accountability percentage |  | 56.00% | 53.00%

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