Quarterly report pursuant to Section 13 or 15(d)

Other Current Liabilities (Details)

v3.8.0.1
Other Current Liabilities (Details) - Carrier
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
kW
Sep. 30, 2016
USD ($)
Mar. 31, 2017
USD ($)
Other Current Liabilities          
Capacity of microturbine (in kW) | kW     200    
Royalties earned $ 0.2 $ 0.1 $ 0.5 $ 0.3  
Unpaid earned royalties $ 0.2   $ 0.2   $ 0.3