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Income Taxes (Details 4) $ in Thousands, € in Millions | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Apr. 30, 2014 EUR (€) | Apr. 30, 2014 USD ($)
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Net operating loss carryforward | $ 8,616 | $ 7,877 |  |
State income taxes | 300 | 270 |  |
Inventory capitalization and reserve | 5,365 | 6,843 |  |
Deferred revenue | 584 | 864 |  |
Accrued payroll and benefits | 1,793 | 1,571 |  |
Share-based compensation | 10,125 | 8,437 |  |
Research and development credits | 13,071 | 9,863 |  |
Alternative minimum tax | 529 | 447 |  |
Accrued professional fees | 987 | 568 |  |
Product return allowance | 1,545 | 1,221 |  |
Accrued chargebacks | 5,910 | 4,792 |  |
Bad debt reserve | 253 | 67 |  |
Intangibles | 3,370 | 3,861 |  |
Accrued for workers’ compensation insurance | 1,035 | 864 |  |
Total deferred tax assets | 53,483 | 47,545 |  |
Deferred tax liabilities: |  |  |  |
Depreciation/amortization | 15,065 | 15,649 |  |
Intangibles | 5,430 | 4,753 |  |
Federal impact of state deferred taxes | 3,380 | 2,910 |  |
Other | 1,241 | 937 |  |
Total deferred tax liabilities | 25,116 | 24,249 |  |
Valuation allowance | (923) | (3,862) | € (3.2) | $ (4,400)
Net deferred tax assets | $ 27,444 | $ 19,434 |  |

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