Quarterly report pursuant to Section 13 or 15(d)

Other Current Liabilities (Details)

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Other Current Liabilities (Details) - Carrier - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 19, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jul. 25, 2018
Mar. 31, 2018
Other Current Liabilities              
Payment of royalty settlement $ 3,000            
C200 and C1000              
Other Current Liabilities              
Royalties earned   $ 0 $ 200 $ 200 $ 500    
C200 and C1000 | Accrued expenses              
Other Current Liabilities              
Current royalty obligation             $ 200
Second Amendment of Development and License Agreement              
Other Current Liabilities              
Royalty-related assets   2,952   $ 2,952      
Amortization period of prepaid royalty       15 years      
Second Amendment of Development and License Agreement | Other current assets              
Other Current Liabilities              
Royalty-related assets   124   $ 124      
Second Amendment of Development and License Agreement | Other assets              
Other Current Liabilities              
Royalty-related assets   $ 2,828   $ 2,828      
Second Amendment of Development and License Agreement | C200              
Other Current Liabilities              
Current royalty obligation           $ 3,000