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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Taxes |
Schedule of income (loss) before income taxes |
|  | Year Ended December 31, |
|  | 2015 |  | 2014 |  | 2013 |
|  | (in thousands) |
Income (loss) before income taxes: |  |  |  |  |  |  |  |  |  |
United States |  | $ | (4,344) |  | $ | (12,946) |  | $ | 20,116 |
Foreign |  |  | (6,020) |  |  | (5,202) |  |  | (2,889) |
Total income (loss) before taxes |  | $ | (10,364) |  | $ | (18,148) |  | $ | 17,227 |
Summary of provision (benefit) for income taxes |
|  | Year Ended December 31, |
|  | 2015 |  | 2014 |  | 2013 |
|  | (in thousands) |
Current provision (benefit): |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 82 |  | $ | (131) |  | $ | 3,306 |
State |  |  | 73 |  |  | 193 |  |  | 541 |
Foreign |  |  | (112) |  |  | 1,388 |  |  | 104 |
Total current provision (benefit) |  |  | 43 |  |  | 1,450 |  |  | 3,951 |
Deferred provision (benefit): |  |  |  |  |  |  |  |  |  |
Federal |  |  | (5,222) |  |  | (4,309) |  |  | 2,254 |
State |  |  | (1,250) |  |  | (1,699) |  |  | 227 |
Foreign |  |  | (1,148) |  |  | (2,891) |  |  | (1,067) |
Total deferred provision (benefit) |  |  | (7,620) |  |  | (8,899) |  |  | 1,414 |
Total provision (benefit) for income taxes |  | $ | (7,577) |  | $ | (7,449) |  | $ | 5,365 |
Schedule of reconciliation of the statutory federal income tax rate |
|  | Year Ended December 31, |
|  | 2015 |  | 2014 |  | 2013 |
Statutory federal income tax (benefit) |  | (35.0) | % | (35.0) | % | 35.0 | %
State tax expense, net of federal tax benefit |  | (7.4) |  | (5.4) |  | 2.9 |
Foreign income tax |  | (24.4) |  | 1.8 |  | 0.3 |
Qualified production activities deduction |  | — |  | — |  | (3.3) |
Research and development credits |  | (15.4) |  | (6.4) |  | (9.9) |
ISO portion of stock options deductions |  | 7.7 |  | 4.0 |  | 6.3 |
Other |  | 1.4 |  | — |  | (0.2) |
Effective tax rate (benefit) |  | (73.1) | % | (41.0) | % | 31.1 | %
Summary of deferred tax assets and liabilities |
|  | December 31, |
|  | 2015 |  | 2014 |
|  | (in thousands) |
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) |
Net deferred tax assets |  | $ | 27,444 |  | $ | 19,434 |
Schedule of unrecognized tax benefits |
|  | December 31,
|  | 2015 |  | 2014 |  | 2013
|  | (in thousands)
Balance at the beginning of the year |  | $ | 4,783 |  | $ | 4,186 |  | $ | 3,532
Additions based on tax positions related to the current year |  |  | 812 |  |  | 655 |  |  | 766
Deductions based on tax audit settlement |  |  | — |  |  | — |  |  | (93)
Deductions based on statute of limitations |  |  | — |  |  | (58) |  |  | (19)
Balance at the end of the year |  | $ | 5,595 |  | $ | 4,783 |  | $ | 4,186

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