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Accrued Liabilities and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accrued Liabilities and Other Current Liabilities    
Employee compensation expense $ 2,900 $ 3,130
Project asset costs 1,058 2,014
Valve installation incentive   2,000
Accrued legal services 131 313
Other accrued liabilities 700 896
Total accrued liabilities and other current liabilities $ 4,789 $ 8,353