Annual report pursuant to Section 13 and 15(d)

Other Current Liabilities (Details)

v3.19.2
Other Current Liabilities (Details) - Carrier
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 19, 2018
USD ($)
Sep. 30, 2013
Mar. 31, 2019
USD ($)
kW
Mar. 31, 2018
USD ($)
Jul. 25, 2018
USD ($)
Other Current Liabilities          
Reduction in fixed rate royalty (as a percent)   50.00%      
Payment of royalty settlement $ 3,000        
C200          
Other Current Liabilities          
Capacity of microturbine (in kW) | kW     200    
C200 and C1000          
Other Current Liabilities          
Current royalty obligation     $ 0    
Royalties earned     400 $ 900  
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     $ 2,892    
Amortization period of prepaid royalty     15 years    
Second Amendment of Development and License Agreement | Other current assets          
Other Current Liabilities          
Royalty-related assets     $ 124    
Second Amendment of Development and License Agreement | Other assets          
Other Current Liabilities          
Royalty-related assets     $ 2,768    
Second Amendment of Development and License Agreement | C200          
Other Current Liabilities          
Current royalty obligation         $ 3,000