Annual report pursuant to Section 13 and 15(d)

Other Current Liabilities (Details)

v3.8.0.1
Other Current Liabilities (Details)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2013
Mar. 31, 2018
USD ($)
kW
Mar. 31, 2017
USD ($)
C200      
Other Current Liabilities      
Capacity of microturbine (in kW) | kW   200  
Carrier      
Other Current Liabilities      
Reduction in fixed rate royalty (as a percent) 50.00%    
Royalties earned   $ 0.9 $ 0.9
Unpaid earned royalties   $ 0.2 $ 0.3