Annual report pursuant to Section 13 and 15(d)

Other Current Liabilities (Details)

v3.7.0.1
Other Current Liabilities (Details) - Carrier - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2013
Mar. 31, 2017
Mar. 31, 2016
Other Current Liabilities      
Reduction in fixed rate royalty (as a percent) 50.00%    
Royalties earned   $ 0.9 $ 1.2
Unpaid earned royalties   $ 0.3 $ 0.2