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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Stock compensation expense | $ 2,624 | $ 3,394 |  |
Goodwill | 2,235 | 2,673 |  |
Royalty accruals | 353 | 992 |  |
Intangible assets | 967 | 0 |  |
Bad debt allowance | 389 | 333 |  |
Inter-company interest expense accrual | 629 | 476 |  |
Other | 399 | 637 |  |
Net operating loss carryforwards | 5,485 | 1,576 |  |
Credit carry-forwards | 584 | 359 |  |
Inventory reserve | 318 | 0 |  |
Total deferred tax assets | 13,983 | 10,440 |  |
Deferred tax liabilities: |  |  |  |
Depreciation | (460) | (777) |  |
Intangible assets | 0 | (294) |  |
Other | (344) | (306) |  |
Total deferred tax liabilities | (804) | (1,377) |  |
Net deferred tax asset before valuation allowance | 13,179 | 9,063 |  |
Valuation allowances for deferred tax assets | (13,179) | (7,832) | $ (2,006) | $ (1,833)
Net deferred tax asset | $ 0 | $ 1,231 |  |

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