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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Mar. 31, 2019 21,652,000          
Balance at Mar. 31, 2019 $ 216 $ 1,044,622 $ (2,101) $ (5) $ (961,539) $ 81,193
Issuance of common stock - ESPP (in shares) 37,000          
Issuance of common stock - ESPP 201 201
Issuance of common stock - restricted shares (in shares) 360,000          
Issuance of common stock - restricted shares $ 4 (4)
Stock-based compensation expense 1,922 1,922
Issuance of stock for 401(k) match (in shares) 44,000          
Issuance of stock for 401(k) match $ 1 341 342
Issuance of common stock-warrant exercise (in shares) 809,000          
Issuance of common stock-warrant exercise $ 8 6,425 6,433
Repurchase of treasury stock (565) (565)
Cumulative translation adjustment (211) (211)
Net loss (17,096) $ (17,096)
Balance (in shares) at Mar. 31, 2020 22,902,000         22,604,410
Balance at Mar. 31, 2020 $ 229 1,053,507 (2,666) (216) (978,635) $ 72,219
Issuance of common stock - ESPP (in shares) 15,000          
Issuance of common stock - ESPP 215 215
Issuance of common stock - restricted shares (in shares) 494,000          
Issuance of common stock - restricted shares $ 5 (5)
Stock-based compensation expense 3,485 3,485
Issuance of stock for 401(k) match (in shares) 30,000          
Issuance of stock for 401(k) match 366 366
Repurchase of treasury stock (927) (927)
Cumulative translation adjustment (61) (61)
Net loss (22,678) $ (22,678)
Exercise of stock options (in shares) 3,000         2,588
Exercise of stock options 63 $ 63
Issuance of common stock - equity offering (in shares) 3,670,000          
Issuance of common stock - equity offering $ 37 51,440 51,477
Issuance of common stock - NEPSI acquisition (in shares) 874,000          
Issuance of common stock - NEPSI acquisition $ 9 12,424 $ 12,433
Balance (in shares) at Mar. 31, 2021 27,988,000         27,593,400
Balance at Mar. 31, 2021 $ 280 $ 1,121,495 $ (3,593) $ (277) $ (1,001,313) $ 116,592