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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2018
Income Tax Disclosure [Abstract] |
Reconciliation of Federal Tax Rate and Actual Income Tax Expense | The sources and tax effects of the differences are as follows:
| Six Months Ended June 30,
| 2018 |  | 2017
U.S. federal statutory tax rate | 21.0 | % |  | 35.0 | %
State income taxes, net of federal tax benefit | 0.6 |  |  | (0.4 | )
General business credits | (0.7 | ) |  | (2.1 | )
Employee stock-based compensation | (12.2 | ) |  | (5.1 | )
Other | 1.9 |  |  | 0.8 |
Effective tax rate | 10.6 | % |  | 28.2 | %
Summary of Income Tax Contingencies | The reconciliation of the beginning unrecognized tax benefits balance to the ending balance is as follows: Note 11—Income Taxes (continued)
| Six Months Ended June 30,
| 2018 |  | 2017
| (In thousands)
Beginning balance | $ | 5,560 |  |  | $ | 7,314 |
Increases related to positions taken during prior years | — |  |  | 321 |
Increases related to positions taken during the current year | 1,099 |  |  | 1,039 |
Decreases related to positions settled with tax authorities | — |  |  | (1,189 | )
Decreases as a result of a lapse of applicable statute of limitations | — |  |  | (636 | )
Ending balance | $ | 6,659 |  |  | $ | 6,849 |
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate | $ | 6,659 |  |  | $ | 6,849 |

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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