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Composition of Certain Financial Statement Captions - Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Current Assets [Abstract]
Prepaid supplies or services, current	$ 440	$ 544
Prepaid insurance	564	556
Prepaid consumption tax in Japan	19	99
Other receivables	91	112
Total other current assets	$ 1,114	$ 1,311

X

- Definition

Amount of current assets classified as other.

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