Quarterly report pursuant to Section 13 or 15(d)

Other Current Liabilities (Details)

v3.7.0.1
Other Current Liabilities (Details) - Carrier
$ in Millions
3 Months Ended
Jun. 30, 2017
USD ($)
kW
Jun. 30, 2016
USD ($)
Mar. 31, 2017
USD ($)
Other Current Liabilities      
Capacity of microturbine (in kW) | kW 200    
Royalties earned $ 0.2 $ 0.2  
Unpaid earned royalties $ 0.2   $ 0.3