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Prepaid Expenses and Other Current Assets (Details)
$ in Thousands
Jun. 30, 2017
USD ($)
Project
Dec. 31, 2016
USD ($)
Prepaid Expenses and Other Current Assets [Abstract]    
Inventory $ 1,549 $ 0
Income tax receivable 115 446
Prepaid expenses 501 422
Other current assets 957 1,184
Total prepaid expenses and other current assets $ 3,122 $ 2,052
Number of projects | Project 3