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INCOME TAXES (Tables)
12 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of components of the provision for income taxes
    Year ended December 31,  
    2018     2017  
Current:            
Federal     54       470  
State     38       70  
      92       540  
Deferred:                
Federal     (22 )     71  
State     (78 )     (68 )
      (100 )     3  
                 
Provision for (benefit from) income taxes   $ (8 )   $ 543  
Schedule of reconciliation of the U.S. federal statutory rate to the effective tax rate
    Year ended December 31,  
    2018     2017  
Federal statutory rate     21 %     34 %
Enactment of the Tax Cuts and Jobs Act     -       14  
State rate, net of federal benefit     6       4  
Tax credits     (26 )     (15 )
Permanent adjustments     1       -  
FDII deduction     (4 )     -  
Other     1       (2 )
Effective tax rate     (1 )%     35 %
Schedule of components of deferred tax assets
    2018     2017  
Depreciation   $ 327     $ 330  
Stock compensation     87       103  
Federal research and development credits     4,689       4,602  
Other     68       36  
Total     5,171       5,071  
Less valuation allowance     (-)       (-)  
Deferred tax assets, net   $ 5,171     $ 5,071  
Schedule of roll forward of the uncertain tax position related to research and development tax credits
Uncertain tax positions at December 31, 2016     1,032  
Decrease due to positions taken in prior periods     (34 )
Uncertain tax positions at December 31, 2017     998  
Decrease due to positions taken in prior periods     -  
Uncertain tax positions at December 31, 2018   $ 998