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Prepaid Expenses and Other Current Assets (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Project
Dec. 31, 2017
USD ($)
Prepaid Expenses and Other Current Assets [Abstract]    
Inventory $ 444 $ 755
Income tax receivable 387 418
Prepaid expenses 402 549
Other current assets 816 1,073
Total prepaid expenses and other current assets $ 2,049 $ 2,795
Number of projects | Project 3