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Intangible Assets - Summary and Other (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2013 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Composition of intangible assets |  |  |  |  |
Total gross amount |  | $ 17,841 | $ 18,024 |  |
Accumulated amortization |  | $ (17,841) | (14,877) |  |
Total |  |  | $ 3,147 |  |
Useful life/amortization period |  | 60 months | 60 months |  |
GMP royalty buyout |  |  |  |  |
Composition of intangible assets |  |  |  |  |
Total gross amount |  | $ 17,500 | $ 17,500 |  |
Non-compete agreements |  |  |  |  |
Composition of intangible assets |  |  |  |  |
Total gross amount |  | 341 | 524 |  |
Amortization expense |  | 200 | 300 |  |
Non-compete agreements | Minimum |  |  |  |  |
Composition of intangible assets |  |  |  |  |
Useful life/amortization period |  |  |  |  | 1 year
Non-compete agreements | Maximum |  |  |  |  |
Composition of intangible assets |  |  |  |  |
Useful life/amortization period |  |  |  |  | 2 years
Buy-out Agreement with GMP | GMP royalty buyout |  |  |  |  |
Composition of intangible assets |  |  |  |  |
Useful life/amortization period | 5 years |  |  |  |
Amortization expense |  | $ 3,000 | $ 3,500 | $ 3,500 |
Notes Payable | Buy-out Agreement with GMP | GMP Note Parties |  |  |  |  |
Composition of intangible assets |  |  |  |  |
Face amount at time of issuance | $ 17,500 |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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