Quarterly report pursuant to Section 13 or 15(d)

Other Current Liabilities (Details)

v3.8.0.1
Other Current Liabilities (Details)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
kW
Dec. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Other Current Liabilities          
Valuation allowance offset as a percentage of changes in deferred tax assets due to changes in tax rate 100.00%   100.00%    
Carrier          
Other Current Liabilities          
Capacity of microturbine (in kW) | kW     200    
Royalties earned $ 0.3 $ 0.2 $ 0.7 $ 0.6  
Unpaid earned royalties $ 0.3   $ 0.3   $ 0.3