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Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Prepaid Expenses And Other Current Assets |  |
Advances to suppliers | $ 423 | $ 163
Prepaid insurance | 665 | 869
Vendor deposits | 224 | 501
IVA taxes receivable, net | 111 |
Other current assets | 238 | 234
Total | $ 1,661 | $ 1,767

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