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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Summary of Expense (Benefit) for Income Taxes | The expense (benefit) for income taxes for the years ended December 31, was as follows:
|  | 2015 |  |  | 2014 |  |  | 2013 |
Current tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | (446 | ) |  | $ | 5,650 |  |  | $ | 2,629 |
State |  |  | 55 |  |  |  | 1,448 |  |  |  | 955 |
|  |  | (391 | ) |  |  | 7,098 |  |  |  | 3,584 |
Deferred tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 345 |  |  |  | 3,050 |  |  |  | 967 |
State |  |  | (342 | ) |  |  | 665 |  |  |  | 208 |
|  |  | 3 |  |  |  | 3,715 |  |  |  | 1,175 |
Total tax (benefit) expense |  | $ | (388 | ) |  | $ | 10,813 |  |  | $ | 4,759 |
Summary of Company's Effective Tax Rate on Income From Continuing Operations and Statutory Tax Rate | A reconciliation between the Company’s effective tax rate on income from continuing operations and the statutory tax rate for the years ended December 31, was as follows:
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | Amount |  |  | Percent |  |  | Amount |  |  | Percent |  |  | Amount |  |  | Percent |
Income tax expense (benefit) at federal statutory rate |  | $ | 4,862 |  |  |  | 35.0 | % |  | $ | 12,089 |  |  |  | 35.0 | % |  | $ | (4,760 | ) |  |  | 34.0 | %
State income tax, net of federal benefit |  |  | 178 |  |  |  | 1.3 |  |  |  | 1,403 |  |  |  | 4.0 |  |  |  | 848 |  |  |  | (6.1 | )
Non-deductible private placement warrant (income)/expense |  |  | (3,255 | ) |  |  | (23.4 | ) |  |  | (2,159 | ) |  |  | (6.2 | ) |  |  | 9,531 |  |  |  | (68.0 | )
Domestic production activity |  |  | — |  |  |  | — |  |  |  | (295 | ) |  |  | (0.9 | ) |  |  | (376 | ) |  |  | 2.7 |
Research tax credits |  |  | (2,437 | ) |  |  | (17.6 | ) |  |  | (1,001 | ) |  |  | (2.9 | ) |  |  | (1,054 | ) |  |  | 7.5 |
Tax reserve reassessment |  |  | 315 |  |  |  | 2.3 |  |  |  | 170 |  |  |  | 0.5 |  |  |  | 570 |  |  |  | (4.1 | )
Other, net |  |  | (51 | ) |  |  | (0.4 | ) |  |  | 606 |  |  |  | 1.8 |  |  |  | — |  |  |  | — |
Income tax expense (benefit) |  | $ | (388 | ) |  |  | (2.8 | )% |  | $ | 10,813 |  |  |  | 31.3 | % |  | $ | 4,759 |  |  |  | (34.0 | )%
Summary of Components of Deferred Income Tax Assets and Liabilities | Components of the deferred income tax assets and liabilities consisted of the following as of December 31:
|  | 2015 |  |  | 2014 |
Deferred tax assets |  |  |  |  |  |  |  |
Inventory |  | $ | 2,861 |  |  | $ | 2,143 |
Allowances and bad debts |  |  | 398 |  |  |  | 280 |
Accrued warranty |  |  | 778 |  |  |  | 1,022 |
Accrued wages and benefits |  |  | 627 |  |  |  | 553 |
Stock compensation |  |  | 488 |  |  |  | 391 |
Other |  |  | 515 |  |  |  | 8 |
Total deferred tax assets |  |  | 5,667 |  |  |  | 4,397 |
Deferred tax liabilities |  |  |  |  |  |  |  |
Intangibles |  |  | (944 | ) |  |  | (1,810 | )
Tax depreciation in excess of book |  |  | (3,904 | ) |  |  | (1,830 | )
Total deferred tax liabilities |  |  | (4,848 | ) |  |  | (3,640 | )
Net deferred tax assets |  | $ | 819 |  |  | $ | 757 |
Schedule of Net Deferred Tax Assets and Liabilities | The Company’s net deferred tax assets and liabilities are presented as follows in the Company’s consolidated balance sheets as of December 31:
|  | 2015 |  |  | 2014 |
Current deferred tax assets, net |  | $ | — |  |  | $ | 3,998 |
Non-current deferred tax asset/(liabilities), net |  |  | 819 |  |  |  | (3,241 | )
Net deferred tax assets |  | $ | 819 |  |  | $ | 757 |
Schedule of Change in Unrecognized Tax Benefits | The change in unrecognized tax benefits excluding interest and penalties for the years ended December 31, 2015 and 2014 were as follows:
|  | 2015 |  |  | 2014 |
Balance at beginning of year |  | $ | 723 |  |  | $ | 555 |
Additions based on tax positions related to the current year |  |  | 261 |  |  |  | 255 |
Additions/(Reductions) for tax positions of prior years |  |  | 44 |  |  |  | (87 | )
Balance at end of year |  | $ | 1,028 |  |  | $ | 723 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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