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Restructuring Charges (Tables) | 12 Months Ended
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Dec. 31, 2017
Restructuring And Related Activities [Abstract] |
Components of Restructuring Liabilities | As of December 31, 2017 and 2016, the components of these liabilities are shown below (in thousands):
|  | Employee Severance |  |  | Contract |  |  |  |  |  |  |  |  |  |  |  |
|  | and Other Benefits |  |  | Termination Costs |  |  | Stock-based Compensation |  |  | Asset Impairment |  | Total |
Balance at December 31, 2015 |  | $ | 343 |  |  | $ | 116 |  |  | $ | — |  |  | $ | — |  | $ | 459 |
Restructuring charges |  |  | 3,720 |  |  |  | 29 |  |  |  | 619 |  |  |  | 198 |  |  | 4,566 |
Non-cash charges |  |  | — |  |  |  | — |  |  |  | (619 | ) |  |  | (198 | ) |  | (817 | )
Cash payments |  |  | (469 | ) |  |  | (145 | ) |  | — |  |  | — |  |  | (614 | )
Balance at December 31, 2016 |  |  | 3,594 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 3,594 |
Restructuring charges |  |  | 3,447 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 3,447 |
Cash payments |  |  | (6,911 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  | (6,911 | )
Balance at December 31, 2017 |  | $ | 130 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  | $ | 130 |
The Company expects to pay the remaining $0.1 million in 2018.

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 + Details
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