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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Schedule of Components of Income (Loss) Before Income Taxes | The components of income before provision for income taxes are as follows (in thousands):
| Year ended December 31,
| 2018 |  | 2017 |  | 2016
Domestic | $ | 17,405 |  |  | $ | 22,409 |  |  | $ | 9,677 |
Foreign | 551 |  |  | 60 |  |  | 135 |
Total | $ | 17,956 |  |  | $ | 22,469 |  |  | $ | 9,812 |
Schedule of Components of (Provision) Benefit for Income Taxes | The components of the benefit (provision) for income taxes are as follows (in thousands):
| Year ended December 31,
| 2018 |  | 2017 |  | 2016
Current: |  |  |  |  |  |  |
U.S. federal | $ | (2,414 | ) |  | $ | (2,058 | ) |  | $ | (9,978 | )
State | (948 | ) |  | (369 | ) |  | (2,096 | )
Foreign | (8 | ) |  | — |  |  | — |
Total current | (3,370 | ) |  | (2,427 | ) |  | (12,074 | )
Deferred: |  |  |  |  |  |  |
U.S. federal | 1,005 |  |  | 13,246 |  |  | 8,384 |
State | 101 |  |  | (21 | ) |  | (773 | )
Foreign | (167 | ) |  | 208 |  |  | (36 | )
Total deferred | 939 |  |  | 13,433 |  |  | 7,575 |
Total (provision) benefit for income taxes | $ | (2,431 | ) |  | $ | 11,006 |  |  | $ | (4,499 | )
Schedule of Reconciliation of Federal Statutory Rate to Company's Effective Tax Rate | The following table presents a reconciliation of the federal statutory rate to the Company’s effective tax rate:
| Year ended December 31,
| 2018 |  | 2017 |  | 2016
Federal statutory rate | 21.0 | % |  | 35.0 | % |  | 35.0 | %
Federal tax deferred rate change | — | % |  | (53.8 | )% |  | — | %
State tax, net of federal benefit | 2.6 | % |  | 0.6 | % |  | 0.7 | %
State tax deferred rate change, net of federal benefit | 0.9 | % |  | 0.9 | % |  | 18.7 | %
Nondeductible business expenses | 1.4 | % |  | — | % |  | 2.0 | %
Provision-to-return adjustment | (3.9 | )% |  | — | % |  | — | %
Uncertain tax positions | (1.3 | )% |  | (1.7 | )% |  | 2.0 | %
Stock based compensation | (8.6 | )% |  | (28.1 | )% |  | (16.8 | )%
Others | 1.4 | % |  | (1.9 | )% |  | 4.3 | %
Effective tax rate | 13.5 | % |  | (49.0 | )% |  | 45.9 | %
Schedule of Components of Net Deferred Taxes | The deferred tax assets and liabilities are reported in the accompanying balance sheets as follows (in thousands):
| December 31, 2018 |  | December 31, 2017
Deferred tax assets | $ | 56 |  |  | $ | 245 |
Deferred tax liabilities | 20,217 |  |  | 21,341 |
Net deferred tax liabilities | $ | 20,161 |  |  | $ | 21,096 |
The components of net deferred taxes arising from temporary differences are as follows (in thousands):
| December 31, 2018 |  | December 31, 2017
Deferred tax assets: |  |  |
Compensation | $ | 928 |  |  | $ | 1,056 |
Inventories and receivables | 3,008 |  |  | 2,965 |
Accrued expenses | 424 |  |  | 663 |
Stock compensation | 5,175 |  |  | 3,497 |
Net operating losses | 43 |  |  | 210 |
Other | 898 |  |  | 925 |
Deferred tax assets | 10,476 |  |  | 9,316 |
Deferred tax liabilities: |  |  |
Goodwill | 2,618 |  |  | 2,214 |
Fixed assets | 2,405 |  |  | 1,923 |
Intangible assets | 24,591 |  |  | 25,962 |
Other | 1,023 |  |  | 313 |
Deferred tax liabilities | 30,637 |  |  | 30,412 |
Net deferred tax liabilities | $ | 20,161 |  |  | $ | 21,096 |
Schedule of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
| Year ended December 31,
| 2018 |  | 2017 |  | 2016
Balance at beginning of year | $ | 764 |  |  | $ | 1,208 |  |  | $ | 1,256 |
Increases for prior year tax positions | — |  |  | 63 |  |  | 438 |
Increases for current year tax positions | 173 |  |  | 68 |  |  | 103 |
Decreases for prior year tax positions | (8 | ) |  | (1 | ) |  | (589 | )
Decreases due to settlements | — |  |  | (32 | ) |  | — |
Decreases due to statutes lapsing | (358 | ) |  | (542 | ) |  | — |
Balance at end of year | $ | 571 |  |  | $ | 764 |  |  | $ | 1,208 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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