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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, beginning balance | $ 68,114 | $ 68,114
Accumulated Amortization | (38,389) | (37,088)
Accumulated Impairment Loss | (19,258) | (19,258)
Net Carrying Value, ending balance | $ 10,467 | $ 11,768
Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (in years) | 15 years | 15 years
Gross Carrying Amount, beginning balance | $ 7,100 | $ 7,100
Accumulated Amortization | (2,080) | (2,045)
Accumulated Impairment Loss | (4,179) | (4,179)
Net Carrying Value, ending balance | $ 841 | $ 876
Existing technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (in years) | 13 years | 13 years
Gross Carrying Amount, beginning balance | $ 12,600 | $ 12,600
Accumulated Amortization | (5,972) | (5,831)
Accumulated Impairment Loss | (4,328) | (4,328)
Net Carrying Value, ending balance | $ 2,300 | $ 2,441
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (in years) | 11 years | 11 years
Gross Carrying Amount, beginning balance | $ 33,500 | $ 33,500
Accumulated Amortization | (18,870) | (18,405)
Accumulated Impairment Loss | (10,751) | (10,751)
Net Carrying Value, ending balance | $ 3,879 | $ 4,344
Reacquired rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (in years) | 3 years | 3 years
Gross Carrying Amount, beginning balance | $ 7,500 | $ 7,500
Accumulated Amortization | (7,500) | (7,059)
Accumulated Impairment Loss | 0 | 0
Net Carrying Value, ending balance | $ 0 | $ 441
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (in years) | 8 years | 8 years
Gross Carrying Amount, beginning balance | $ 6,796 | $ 6,796
Accumulated Amortization | (3,377) | (3,165)
Accumulated Impairment Loss | 0 | 0
Net Carrying Value, ending balance | $ 3,419 | $ 3,631
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Amortization Period (in years) | 2 years | 2 years
Gross Carrying Amount, beginning balance | $ 618 | $ 618
Accumulated Amortization | (590) | (583)
Accumulated Impairment Loss | 0 | 0
Net Carrying Value, ending balance | $ 28 | $ 35

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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