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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of net deferred income tax assets
   2020   2019 
Deferred tax assets (liabilities):        
Net operating loss carryforwards  $20,898   $15,239 
Tax credit carryforwards   1,341    1,341 
Reserves   456    308 
Share-based compensation   172    308 
Depreciation and amortization   (54)   (16)
Other   89    91 
           
Total deferred tax assets   22,902    17,271 
Less valuation allowance   (22,902)   (17,271)
           
Net deferred tax assets (liabilities)  $
-
   $
-