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Employee Benefit Plan (Tables) | 12 Months Ended
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Dec. 31, 2017
Postemployment Benefits [Abstract] |
Details of Company Contribution to Plan |
| Year ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands)
Company contribution to 401 (k) plan | $ | 259 |  |  | $ | 172 |  |  | $ | 127 |

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- Definition Tabular disclosure of defined contribution pension plans or defined contribution other postretirement plans, separately for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- References No definition available. + Details
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