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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Jul. 12, 2018
Loss Contingencies [Line Items] |  |
Percentage of royalty obligations, majority are less than | 3.00% |
Threatened Litigation |  |
Loss Contingencies [Line Items] |  |
Estimate of potential loss from litigation |  | $ 510
Minimum |  |
Loss Contingencies [Line Items] |  |
Percentage of royalty obligations | 0.50% |
Maximum |  |
Loss Contingencies [Line Items] |  |
Percentage of royalty obligations | 5.00% |

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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12021-110248 + Details
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