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Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Allowances and reserves $ 705 $ 955
Accrued expenses 1,452 2,331
Inventory reserves 7,071 9,631
Net operating loss carryforwards 37,444 43,427
Property and equipment 2,730 2,420
Intangible asset 3,291  
Stock-based compensation 1,766 2,377
Legal settlement 11,494 11,806
Goodwill 3,029 3,362
Income tax credit carryforwards 5,429 3,235
Total deferred tax assets 74,411 79,544
Valuation allowance (58,202) (63,612)
Total deferred tax assets, net of valuation allowance 16,209 15,932
Deferred tax liabilities:    
Investment in foreign partnership 16,215 15,467
Intangible assets   465
Total deferred tax liabilities 16,215 15,932
Net deferred tax assets (liabilities) $ (6) $ 0