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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of segment information |  |  |  |  |  |  |  |  |  |  |
Total Assets | $ 104,713 |  |  |  | $ 104,260 |  |  |  | $ 104,713 | $ 104,260 |
Net revenues from external customers | 14,737 | 13,005 | 9,580 | 11,651 | 13,635 | 6,375 | 5,742 | 5,636 | 48,973 | 31,388 | 30,037
Operating income |  |  |  |  |  |  |  |  | 14,943 | 193 | (878)
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 2,663 | 2,727 | 2,790
Write-off of in-process research and development |  |  |  |  |  |  |  |  | 480 |  |
Income tax expense | (138) | (60) | (110) | (66) | 1,636 | (142) | (338) | 35 | (374) | 1,191 | 13,270
Interest expense, net |  |  |  |  |  |  |  |  | 2,077 | 2,924 |
Gain on sale of Avinza Product Line before income taxes |  |  |  |  |  |  |  |  | 2,588 | 3,656 |
Income tax expense from discontinuing operations |  |  |  |  |  |  |  |  |  | (1,509) |
Ligand |  |  |  |  |  |  |  |  |  |  |
Summary of segment information |  |  |  |  |  |  |  |  |  |  |
Total Assets | 38,408 |  |  |  | 28,731 |  |  |  | 38,408 | 28,731 |
Net revenues from external customers |  |  |  |  |  |  |  |  | 21,436 | 19,582 |
Operating income |  |  |  |  |  |  |  |  | 253 | (919) |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 233 | 222 |
Write-off of in-process research and development |  |  |  |  |  |  |  |  | 0 |  |
Income tax expense |  |  |  |  |  |  |  |  | (419) | 1,096 |
Interest expense, net |  |  |  |  |  |  |  |  | 2,077 | 2,924 |
Gain on sale of Avinza Product Line before income taxes |  |  |  |  |  |  |  |  | 2,588 | 3,656 |
Income tax expense from discontinuing operations |  |  |  |  |  |  |  |  |  | (1,509) |
CyDex |  |  |  |  |  |  |  |  |  |  |
Summary of segment information |  |  |  |  |  |  |  |  |  |  |
Total Assets | 66,305 |  |  |  | 75,529 |  |  |  | 66,305 | 75,529 |
Net revenues from external customers |  |  |  |  |  |  |  |  | 27,537 | 11,806 |
Operating income |  |  |  |  |  |  |  |  | 14,690 | 1,112 |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 2,430 | 2,505 |
Write-off of in-process research and development |  |  |  |  |  |  |  |  | 480 |  |
Income tax expense |  |  |  |  |  |  |  |  | 45 | 95 |
Interest expense, net |  |  |  |  |  |  |  |  | 0 | 0 |
Gain on sale of Avinza Product Line before income taxes |  |  |  |  |  |  |  |  | 0 | 0 |
Income tax expense from discontinuing operations |  |  |  |  |  |  |  |  |  | $ 0 |

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