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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets [Abstract]    
Allowances and reserves $ 573 $ 673
Accrued expenses 701 951
Deferred revenue and gain-on-sale 33 39
Stock based compensation 1,947 4,547
Net operating loss carryforwards 125,182 119,000
Income tax credit carryforwards 7,764 7,437
Property and equipment, principally due to differences in depreciation 675 683
Other, net 15 16
Deferred tax assets (Total) 136,890 133,346
Valuation allowance (134,873) (131,187)
Total deferred tax assets, net of allowance 2,017 2,159
Deferred tax liabilities [Abstract]    
Intangibles assets (2,017) (2,159)
Total deferred tax liability (2,017) (2,159)
Net deferred tax assets (liability) $ 0 $ 0