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Composition of Certain Financial Statement Captions - Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other Current Assets [Abstract]    
Prepaid supplies or services, current $ 544 $ 734
Prepaid insurance 556 83
Prepaid consumption tax in Japan 99 2
Other receivables 112 51
Total other current assets $ 1,311 $ 870