Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

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Basis of Presentation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 19, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Mar. 31, 2017
Reconciliation of total cash, cash equivalents and restricted cash              
Cash and cash equivalents   $ 12,303   $ 12,303   $ 14,408  
Restricted cash   6,000   6,000   5,000  
Total cash, cash equivalents and restricted cash   18,303 $ 15,156 18,303 $ 15,156 19,408 $ 19,705
Net loss   4,357 3,667 9,255 7,760    
Cash used in operating activities       12,595 5,852    
Cash, cash equivalents and restricted cash   18,303 $ 15,156 18,303 $ 15,156 19,408 $ 19,705
Outstanding borrowings   12,496   12,496   $ 8,527  
Carrier              
Reconciliation of total cash, cash equivalents and restricted cash              
Payment of royalty settlement $ 3,000            
Credit Facility              
Reconciliation of total cash, cash equivalents and restricted cash              
Restricted cash   6,000   6,000      
Doubt about Company’s ability to meet obligations for next 12 months              
Reconciliation of total cash, cash equivalents and restricted cash              
Total cash, cash equivalents and restricted cash   18,300   18,300      
Net loss   4,400          
Cash used in operating activities   6,600          
Cash, cash equivalents and restricted cash   18,300   18,300      
Doubt about Company’s ability to meet obligations for next 12 months | Carrier              
Reconciliation of total cash, cash equivalents and restricted cash              
Payment of royalty settlement   3,000          
Doubt about Company’s ability to meet obligations for next 12 months | Credit Facility              
Reconciliation of total cash, cash equivalents and restricted cash              
Outstanding borrowings   $ 12,500   $ 12,500