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Other Assets, Net - Summary of Other Assets, Net (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |  |
Prepaid assets | $ 155 | $ 218
Prepaid insurance | 115 | 45
Other | 33 | 99
Other assets, net | $ 303 | $ 362

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