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Accrued Liabilities and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accrued Liabilities and Other Current Liabilities    
Employee compensation expense $ 2,252 $ 3,130
Project asset costs 1,091 2,014
Valve installation incentive   2,000
Accrued legal services 306 313
Other accrued liabilities 538 896
Total accrued liabilities and other current liabilities $ 4,187 $ 8,353