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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
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Depreciation and amortization $ 362 $ 338  
Loss from disposal of long-lived assets, net 2 18  
Net loss $ 13,196 $ 12,010  
Net loss per common share diluted (in dollars per share) $ (0.71) $ (0.68)  
Net loss per common share basic (in dollars per share) $ (0.71) $ (0.68)  
Consolidated Balance Sheets      
Additional paid-in capital $ 504,298   $ 500,125
Accumulated deficit (329,750)   $ (313,829)
Consolidated Statement of Stockholders’ Equity      
Stock option exercises 872 $ 6,371 [1]  
Retirement of common stock $ 2,725 1,000 [1]  
Impact of Prior Period Errors      
Depreciation and amortization   60  
Loss from disposal of long-lived assets, net   15  
Net loss   $ 60  
Net loss per common share diluted (in dollars per share)   $ 0.01  
Net loss per common share basic (in dollars per share)   $ 0.01  
Consolidated Balance Sheets      
Additional paid-in capital   $ 1,000  
Accumulated deficit   $ (1,000)  
Common ‎stock      
Consolidated Statement of Stockholders’ Equity      
Stock option exercises (in shares) 37 295 [1]  
Retirement of common stock (in shares) (56) (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 $ 872 $ 6,371 [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 13,196 12,010  
Consolidated Statement of Stockholders’ Equity      
Retirement of common stock $ 2,725 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   $ (15)  
[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.