v3.21.2
Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Beginning balance, value at Dec. 31, 2019 $ 17 $ 149,017 $ (135,262) $ 13,772
Beginning balance, shares at Dec. 31, 2019 17,117      
Stock-based compensation $ 1 628 629
Stock-based compensation, shares 420      
Warrant exercise 164 164
Warrant Exercise, shares 189      
Warrant modification 139 139
Net loss (3,645) (3,645)
Ending balance, value at Mar. 31, 2020 $ 18 149,948 (138,907) 11,059
Ending balance, shares at Mar. 31, 2020 17,726      
Underwritten public offering of common stock, net of commissions and expenses $ 2 9,393 9,395
Underwritten public offering of common stock, net of commissions and expenses, shares 2,024      
Stock-based compensation 766 766
Stock option exercise 137 137
Stock option exercise, shares 33      
Net loss (3,779) (3,779)
Ending balance, value at Jun. 30, 2020 $ 20 160,244 (142,686) 17,578
Ending balance, shares at Jun. 30, 2020 19,783      
Beginning balance, value at Dec. 31, 2020 $ 22 187,463 (150,140) 37,345
Beginning balance, shares at Dec. 31, 2020 22,375      
Stock-based compensation 731 731
Stock-based compensation, shares 71      
At-the-market sale of stock, net of commissions and expenses 243 243
At-the-market sale of stock, net of commissions and expenses, shares 14      
Stock option exercise $ 1 2,514 2,515
Stock option exercise, shares 398      
Warrant exercise
Warrant Exercise, shares 223      
Forfeited restricted stock awards
Forfeited restricted stock awards, shares (54)      
Net loss (3,620) (3,620)
Ending balance, value at Mar. 31, 2021 $ 23 190,951 (153,760) 37,214
Ending balance, shares at Mar. 31, 2021 23,027      
Stock-based compensation 847 847
Stock-based compensation, shares 18      
Stock option exercise 354 354
Stock option exercise, shares 59      
Net loss     (3,726) (3,726)
Ending balance, value at Jun. 30, 2021 $ 23 $ 192,152 $ (157,486) $ 34,689
Ending balance, shares at Jun. 30, 2021 23,104