Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Change in Level 2 Assets (Details)

v3.10.0.1
Fair Value Measurements - Change in Level 2 Assets (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unrealized loss included in net income for the quarter ended March 31, 2018 $ (78,723)  
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unrealized loss included in other comprehensive loss for the year ended December 31, 2017 (244,040)  
Eurosite Power Inc | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unrealized loss included in other comprehensive loss for the year ended December 31, 2017 (244,040) $ (165,317)
Eurosite Power Inc | Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, beginning 354,251  
Fair value, ending $ 275,528 $ 354,251