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INCOME TAXES (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
INCOME TAXES    
Deferred tax assets, net of valuation allowance $ 4,609  
Net operating loss (NOL) carryforwards 12,500  
Tax credit carryforwards 1,700  
Annual limitation for usage of NOL 2,000  
Annual limitation for usage of tax credits 420  
Deferred tax expense $ 1,817 $ 511