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INCOME TAXES - Principal components of deferred tax assets (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Depreciation $ 435 $ 394
Stock compensation 225 256
Capitalized research and development costs 39
Other 418 310
Total 1,078 999
Less valuation allowance
Deferred tax assets, net $ 1,078 $ 999