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Segment Information - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Operating Segments [Line Items] |  |  |
Revenues from performance obligations satisfied | $ 0 | $ 0 |
Revenue | 338,160,000 | 425,940,000 | $ 425,215,000
ROW (Segment) [Member] |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |
Revenue | 89,206,000 | 108,869,000 |
ROW (Segment) [Member] | One major customer [Member] |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |
Revenue | $ 23,118,000 | $ 37,197,000 | $ 36,518,000
Percentage of entity's revenue from major customer | 6.84% | 8.73% | 8.59%

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