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3. Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following potentially dilutive securities outstanding for the three months ended March 31, 2022 and 2021 have been excluded from the computation of diluted weighted average shares outstanding, as they would be anti-dilutive (in thousands):

 

Three Months
Ended March 31,
2022 2021
Outstanding stock options 10,299 7,204
Restricted stock units - 2,400
Outstanding warrants 2,635 3,920
Convertible debt     3,704     5,326
16,638 18,850