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Summary of Significant Accounting Policies - Intangibles (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Patents, licenses, and other intangible assets |  |  |
Number of primary criteria to determine capitalization of patent | item | 3 |  |
Abandonment of capitalized intangible assets | $ 239 | $ 396 | $ 356
Total gross carrying amount | 17,374 | 15,685 |
Patents, licenses, and other intangible assets, net | 11,969 | 11,148 |
Amortization expense for patents, licenses, and other intangible assets | 900 | 800 | $ 800
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2019 | 862 |  |
2020 | 860 |  |
2021 | 757 |  |
2022 | 730 |  |
2023 | 659 |  |
Thereafter | 1,923 |  |
Total | 5,791 |  |
Nonamortizable intangible assets (trademarks) |  |  |
Patents, licenses, and other intangible assets |  |  |
Nonamortizable intangible assets (trademarks) | $ 399 | 399 |
Acquired licenses | Minimum |  |  |
Patents, licenses, and other intangible assets |  |  |
Estimated economic life | 5 years |  |
Acquired licenses | Maximum |  |  |
Patents, licenses, and other intangible assets |  |  |
Estimated economic life | 25 years |  |
Patents |  |  |
Patents, licenses, and other intangible assets |  |  |
Accumulated amortization | $ (4,142) | (3,413) |
Patents | Minimum |  |  |
Patents, licenses, and other intangible assets |  |  |
Estimated economic life | 13 years |  |
Patents | Maximum |  |  |
Patents, licenses, and other intangible assets |  |  |
Estimated economic life | 20 years |  |
Patents, definite life |  |  |
Patents, licenses, and other intangible assets |  |  |
Amortizable intangible assets | $ 9,320 | 8,915 |
Patents, pending issuance |  |  |
Patents, licenses, and other intangible assets |  |  |
Amortizable intangible assets | 5,644 | 4,360 |
Licenses and other amortizable intangible assets |  |  |
Patents, licenses, and other intangible assets |  |  |
Amortizable intangible assets | 2,011 | 2,011 |
Accumulated amortization | (1,263) | $ (1,124) |
In-process intangible assets |  |  |
Patents, licenses, and other intangible assets |  |  |
Total gross carrying amount | $ 5,600 |  |

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