Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Change in Level 3 Assets (Details)

v3.8.0.1
Fair Value Measurements - Change in Level 3 Assets (Details) - Fair Value, Measurements, Recurring
9 Months Ended
Sep. 30, 2017
USD ($)
trading_day
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Unrealized loss recognized in other comprehensive loss $ (184,998)
Eurosite Power Inc  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Unrealized loss recognized in other comprehensive loss $ (184,998)
Eurosite Power Inc | Level 3  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Number of trading days included in fair value measurement | trading_day 15
Fair value at September 30, 2017 $ 334,570