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Nature of Operations and Basis of Presentation - Comparison of Reported Results of Operations and Cash Flows as a Result of Reclassifications (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2022
Depreciation and amortization $ 372 $ 335 $ 734 $ 673  
Loss from disposal of long-lived assets, net 20 36 22 54  
Net loss $ 10,643 $ 1,777 $ 23,839 $ 13,787  
Net loss per common share diluted (in dollars per share) $ (0.56) $ (0.10) $ (1.27) $ (0.77)  
Net loss per common share basic (in dollars per share) $ (0.56) $ (0.10) $ (1.27) $ (0.77)  
Consolidated Balance Sheets          
Additional paid-in capital $ 508,480   $ 508,480   $ 500,125
Accumulated deficit (342,393)   (342,393)   $ (313,829)
Consolidated Statement of Stockholders’ Equity          
Stock option exercises   $ 3,932 872 $ 10,304 [1]  
Retirement of common stock $ 2,000   $ 4,725 1,000 [1]  
Impact of Prior Period Errors          
Depreciation and amortization   78   138  
Loss from disposal of long-lived assets, net   20   35  
Net loss   $ (14)   $ 46  
Net loss per common share diluted (in dollars per share)   $ 0   $ 0  
Net loss per common share basic (in dollars per share)   $ 0   $ 0  
Consolidated Balance Sheets          
Additional paid-in capital   $ 1,000   $ 1,000  
Accumulated deficit   $ (1,000)   $ (1,000)  
Common ‎stock          
Consolidated Statement of Stockholders’ Equity          
Stock option exercises (in shares)   206 37 501 [1]  
Retirement of common stock (in shares) (54)   (110) (20) [1]  
Common ‎stock | Impact of Prior Period Errors          
Consolidated Statement of Stockholders’ Equity          
Stock option exercises (in shares)       20  
Retirement of common stock (in shares)       (20)  
Additional ‎paid-in ‎capital          
Consolidated Statement of Stockholders’ Equity          
Stock option exercises   $ 3,932 $ 872 $ 10,304 [1]  
Additional ‎paid-in ‎capital | Impact of Prior Period Errors          
Consolidated Statement of Stockholders’ Equity          
Stock option exercises       1,000  
Retirement of common stock       0  
Accumulated ‎deficit          
Net loss $ 10,643 1,777 23,839 13,787  
Consolidated Statement of Stockholders’ Equity          
Retirement of common stock $ 2,000   $ 4,725 1,000 [1]  
Accumulated ‎deficit | Impact of Prior Period Errors          
Consolidated Statement of Stockholders’ Equity          
Stock option exercises       0  
Retirement of common stock       1,000  
Impairment of long-lived assets | Impact of Prior Period Errors          
Impairment of long-lived assets   $ (112)   $ (127)  
[1] Includes approximately $1.0 million, or 20,132 shares, received associated with a non-cash exercise of stock options and subsequent retirement. See Note 7 Stockholders’ Equity.