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Fair Value Measurements (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Assets:    
Cash and cash equivalents $ 16,053 $ 13,704
Restricted cash 235 235
Level 1 [Member]    
Assets:    
Cash and cash equivalents 16,053 13,704
Restricted cash 235 235
Liabilities:    
Note payable
Senior secured convertible debentures, net
Unsecured convertible notes payable, net
Level 2 [Member]    
Assets:    
Cash and cash equivalents
Restricted cash
Liabilities:    
Note payable
Senior secured convertible debentures, net
Unsecured convertible notes payable, net
Level 3 [Member]    
Assets:    
Cash and cash equivalents
Restricted cash
Liabilities:    
Note payable 322 312
Senior secured convertible debentures, net 11,196 13,737
Unsecured convertible notes payable, net 5,022 8,844
Carrying Value [Member]    
Assets:    
Cash and cash equivalents 16,053 13,704
Restricted cash 235 235
Liabilities:    
Note payable 322 312
Senior secured convertible debentures, net 10,516 11,809
Unsecured convertible notes payable, net $ 4,928 $ 4,741