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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation of the beginning and ending amount of unrecognized tax benefits |  |  |
Unrecognized tax benefits, beginning of period | $ 1,871 | $ 1,571 | $ 727
Gross increases-tax position in prior period |  | 0 | 548
Gross increases-current period tax position | 351 | 300 | 296
Unrecognized tax benefits, end of period | 2,222 | $ 1,871 | $ 1,571
Interest expense or penalties related to unrecognized tax benefits | 0 |  |
Federal |  |  |
Credit carryforwards |  |  |
Credit carryforwards available to reduce future taxable income | 3,300 |  |
State |  |  |
Credit carryforwards |  |  |
Credit carryforwards available to reduce future taxable income | $ 2,700 |  |

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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