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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2019 $ 49,450 $ 50 $ 12 $ 188,103 $ (138,715)
Balance, shares at Dec. 31, 2019   10,000 12,446,000    
Issuance of common stock, net of issuance costs 574 $ 0 $ 1 573 0
Issuance of common stock, net of issuance costs, shares   0 28,000    
Exercise of stock options 135 $ 0 $ 0 135 0
Exercise of stock options, shares   0 8,000    
Issuance of restricted common stock 0 $ 0 $ 0 0 0
Issuance of restricted common stock, shares   0 186,000    
Purchase and retirement of common stock (738) $ 0 $ 0 (738) 0
Purchase and retirement of common stock, shares   0 (23,000)    
Stock-based compensation 2,230 $ 0 $ 0 2,230 0
Net loss (8,908) 0 0 0 (8,908)
Balance at Mar. 31, 2020 42,743 $ 50 $ 13 190,303 (147,623)
Balance, shares at Mar. 31, 2020   10,000 12,645,000    
Balance at Dec. 31, 2020 $ 83,839 $ 50 $ 17 255,024 (171,252)
Balance, shares at Dec. 31, 2020   10,000 16,735,000    
Issuance of common stock, net of issuance costs, shares     0    
Exercise of stock options, shares 0        
Issuance of restricted common stock $ 0 $ 0 $ 0 0 0
Issuance of restricted common stock, shares   0 154,000    
Forfeiture of restricted common stock 0 $ 0 $ 0 0 0
Forfeiture of restricted common stock, shares   0 (19,000)    
Purchase and retirement of common stock (870) $ 0 $ 0 (870) 0
Purchase and retirement of common stock, shares   0 (20,000)    
Stock-based compensation 2,046 $ 0 $ 0 2,046 0
Net loss (8,222) 0 0 0 (8,222)
Balance at Mar. 31, 2021 $ 76,793 $ 50 $ 17 $ 256,200 $ (179,474)
Balance, shares at Mar. 31, 2021   10,000 16,850,000