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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2019 57,997,780      
Balance at Dec. 31, 2019 $ 58 $ 189,422 $ (139,891) $ 49,589
Stock-based compensation $ 0 2,029 0 2,029
Common stock issued to employees and directors, includes RSUs vesting (in shares) 3,097,068      
Common stock issued to employees and directors, includes RSUs vesting $ 3 0 0 3
Net loss $ 0 0 (10,247) (10,247)
Common stock issued for consulting services (in shares) 23,078      
Common stock issued for consulting services $ 0 24 0 24
Balance (in shares) at Sep. 30, 2020 61,117,926      
Balance at Sep. 30, 2020 $ 61 191,475 (150,138) 41,398
Balance (in shares) at Jun. 30, 2020 60,274,096      
Balance at Jun. 30, 2020 $ 60 190,956 (148,301) 42,715
Stock-based compensation $ 0 519 0 519
Common stock issued to employees and directors, includes RSUs vesting (in shares) 843,830      
Common stock issued to employees and directors, includes RSUs vesting $ 1 0 0 1
Net loss $ 0 0 (1,837) (1,837)
Balance (in shares) at Sep. 30, 2020 61,117,926      
Balance at Sep. 30, 2020 $ 61 191,475 (150,138) 41,398
Balance (in shares) at Dec. 31, 2020 64,461,065      
Balance at Dec. 31, 2020 $ 64 196,728 (165,653) 31,139
Stock-based compensation 0 1,696 0 1,696
RSUs issued for consulting services $ 0 114 0 114
Common stock issued to employees and directors, includes RSUs vesting (in shares) 2,100,749      
Common stock issued to employees and directors, includes RSUs vesting $ 2 0 0 2
Net loss $ 0 0 (13,488) $ (13,488)
Common stock issued upon exercise of employee stock options (in shares) 347,901     347,901
Common stock issued upon exercise of employee stock options $ 0 727 0 $ 727
Common stock issued upon warrant exercise (in shares) 65,590      
Common stock issued upon warrant exercise $ 0 0 0 0
Common stock issued for ATM share sales, net (in shares) 2,473,359      
Common stock issued for ATM share sales, net $ 3 9,328 0 9,331
Common stock issued related to LINICO investment (in shares) 375,000      
Common stock issued related to LINICO investment $ 1 1,267 0 1,268
Balance (in shares) at Sep. 30, 2021 69,823,664      
Balance at Sep. 30, 2021 $ 70 209,860 (179,141) 30,789
Balance (in shares) at Jun. 30, 2021 68,607,326      
Balance at Jun. 30, 2021 $ 69 209,382 (177,755) 31,696
Stock-based compensation 0 399 0 399
RSUs issued for consulting services $ 0 79 0 79
Common stock issued to employees and directors, includes RSUs vesting (in shares) 1,216,338      
Common stock issued to employees and directors, includes RSUs vesting $ 1 0 0 1
Net loss $ 0 0 (1,386) (1,386)
Balance (in shares) at Sep. 30, 2021 69,823,664      
Balance at Sep. 30, 2021 $ 70 $ 209,860 $ (179,141) $ 30,789