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INCOME TAX - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets    
Net operating loss carryforwards $ 28,424 $ 31,949
Deferred income and reserves 382 341
Depreciation of fixed assets 0 1,169
Amortization of intangibles 4,315 2,632
Share-based compensation expense 4,419 17,642
Differences related to stock basis in equity investment 233 377
Other 148 4,358
Gross deferred tax assets 37,921 58,468
Valuation allowance (38,348) (57,346)
Deferred tax assets, net of valuation allowance (427) 1,122
Deferred Tax Liabilities    
Depreciation of fixed assets (314) 0
Amortization of intangible assets 0 (1,840)
Other 0 (31)
Gross deferred tax liabilities (314) (1,871)
Net deferred tax liability $ (741) $ (749)