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Liquidity - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents including restricted cash | $ 75,890 | $ 58,205 | $ 57,144 | $ 64,977
Foreign Subsidiaries |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents including restricted cash | 62,100 | $ 33,900 |  |
Wells Fargo |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Off-balance sheet letters of credit | $ 10,500 |  |  |

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