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Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Prepaid Expenses And Other Current Assets [Line Items]
Equipment maintenance and services	$ 1,677	$ 1,091
Prepaid taxes	843	311
Prepaid insurance	629	594
Deferred costs	55	67
Other	697	218
Total prepaid expenses and other current assets	$ 3,901	$ 2,281

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Prepaid Expenses And Other Current Assets [Line Items]

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Prepaid Services and Professional Fees

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Sum of the carrying amounts as of the balance sheet date of deferred costs capitalized at the end of the reporting period that are expected to be charged against earnings within one year or the normal operating cycle, if longer.

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Amount of current assets classified as other.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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