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Other Assets - Summary of Other Assets, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid assets	$ 131	$ 218
Prepaid insurance	36	45
Other	68	99
Other assets, net	$ 235	$ 362

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