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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of deferred tax asset
   December 31, 
Deferred tax assets (in thousands)  2021   2020 
Net operating loss carryforwards  $34,427   $29,317 
Fixed assets   488    814 
Accruals and other   654    248 
Research & development credits   865    448 
Share-based compensation   114    24 
Valuation allowance   (36,548)   (30,851)
Net deferred tax assets  $
   $
 

  

Schedule of deferred tax asset
   December 31, 
Combined NOL Carryforwards (in thousands):  2021   2020 
Federal  $137,956   $117,685 
State  $82,507   $68,800 

  

Schedule of deferred tax asset
   December 31, 
Combined Credit Carryforwards (in thousands):  2021   2020 
Federal  $444   $260 
State  $533   $239 

 

Schedule of statutory federal income tax rate and income taxes
   December 31, 
Rate reconciliation:  2021   2020 
Federal tax benefit at statutory rate   (21.0)%   (21.0)%
State tax, net of federal benefit   (7.3)%   (4.3)%
Permanent differences   0.1%   3.9%
Research & development credits   (2.3)%   (1.2)%
Foreign rate differential   (1.0)%   (0.6)%
Foreign taxes   0.3%   (0.6)%
Change in tax rate   (0.5)%   - 
Change in valuation allowance   32.0%   23.8%
Tax provision   0.3%   
%