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Restatement of Previously Issued Financial Statements (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Consolidated Balance Sheets [Abstract]                
Intangible assets $ 141,116   $ 141,116     $ 122,117    
Accumulated deficit (274,089)   (274,089)     (260,348)    
Consolidated Statements of Operations [Abstract]                
(Gain)/loss from disposal of intangible assets, net (10,230) $ (829) (10,230) $ 3,849        
Net loss $ (1,791) $ (16,280) $ (13,741) $ (31,410)        
Net loss per common share basic and diluted $ (0.10) $ (0.94) $ (0.77) $ (1.82)        
Consolidated Statement of Stockholders’ Equity [Abstract]                
Stockholders' Equity $ 213,279 $ 227,298 $ 213,279 $ 227,298 $ 209,225 212,508 $ 234,447 $ 245,066
Consolidated Statements of Cash Flows [Abstract]                
Net loss (1,791) (16,280) (13,741) (31,410)        
(Gain)/loss from disposal of intangible assets (10,230) (829) (10,230) 3,849        
As Originally Reported [Member]                
Consolidated Balance Sheets [Abstract]                
Intangible assets 130,886   130,886          
Accumulated deficit (284,319)   (284,319)          
Consolidated Statements of Operations [Abstract]                
Net loss $ (12,021)   $ (23,971)          
Net loss per common share basic and diluted $ (0.67)   $ (1.34)          
Consolidated Statement of Stockholders’ Equity [Abstract]                
Stockholders' Equity $ 203,049   $ 203,049          
Consolidated Statements of Cash Flows [Abstract]                
Net loss (12,021)   (23,971)          
Impact of Prior Period Errors [Member]                
Consolidated Balance Sheets [Abstract]                
Intangible assets 10,230   10,230          
Accumulated deficit 10,230   10,230          
Consolidated Statements of Operations [Abstract]                
(Gain)/loss from disposal of intangible assets, net (10,230)   (10,230)          
Net loss $ 10,230   $ 10,230          
Net loss per common share basic and diluted $ 0.57   $ 0.57          
Consolidated Statement of Stockholders’ Equity [Abstract]                
Stockholders' Equity $ 10,230   $ 10,230          
Consolidated Statements of Cash Flows [Abstract]                
Net loss 10,230   10,230          
(Gain)/loss from disposal of intangible assets (10,230)   (10,230)          
Common Stock [Member]                
Consolidated Statement of Stockholders’ Equity [Abstract]                
Stockholders' Equity 2 2 2 2 2 2 2 2
Additional Paid-in Capital [Member]                
Consolidated Statement of Stockholders’ Equity [Abstract]                
Stockholders' Equity 487,366 464,620 487,366 464,620 481,521 472,854 455,489 450,978
Accumulated Deficit [Member]                
Consolidated Statements of Operations [Abstract]                
Net loss (1,791) (16,280) (13,741) (31,410)        
Consolidated Statement of Stockholders’ Equity [Abstract]                
Stockholders' Equity (274,089) (237,324) (274,089) (237,324) $ (272,298) $ (260,348) $ (221,044) $ (205,914)
Consolidated Statements of Cash Flows [Abstract]                
Net loss (1,791) $ (16,280) (13,741) $ (31,410)        
Accumulated Deficit [Member] | As Originally Reported [Member]                
Consolidated Statement of Stockholders’ Equity [Abstract]                
Stockholders' Equity (284,319)   (284,319)          
Accumulated Deficit [Member] | Impact of Prior Period Errors [Member]                
Consolidated Statement of Stockholders’ Equity [Abstract]                
Stockholders' Equity $ 10,230   $ 10,230