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Summary of Significant Accounting Policies - Intangibles (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Patents, licenses, and other intangible assets |  |  |
Number of primary criteria to determine capitalization of patent | item | 3 |  |
Total gross carrying amount | $ 15,685,000 | $ 14,114,000 |
Total intangible assets, net | 11,148,000 | 10,362,000 |
Amortization expense for patents, licenses, and other intangible assets | 784,000 | 755,000 | $ 594,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2018 | 838,000 |  |
2019 | 827,000 |  |
2020 | 780,000 |  |
2021 | 704,000 |  |
2022 | 676,000 |  |
Thereafter | 2,364,000 |  |
Total | 6,189,000 |  |
Nonamortizable intangible assets (trademarks) |  |  |
Patents, licenses, and other intangible assets |  |  |
Nonamortizable intangible assets (trademarks) | $ 399,000 | 399,000 |
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 | $ (3,413,000) | (2,792,000) |
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 | $ 8,915,000 | 7,570,000 |
Patents, pending issuance |  |  |
Patents, licenses, and other intangible assets |  |  |
Amortizable intangible assets | 4,360,000 | 4,134,000 |
Licenses and other amortizable intangible assets |  |  |
Patents, licenses, and other intangible assets |  |  |
Amortizable intangible assets | 2,011,000 | 2,011,000 |
Accumulated amortization | (1,124,000) | (960,000) |
Capitalized patent and licensing |  |  |
Patents, licenses, and other intangible assets |  |  |
Impairment of Intangible Assets (Excluding Goodwill) | 396,000 | $ 356,000 | $ 296,000
In-process intangible assets |  |  |
Patents, licenses, and other intangible assets |  |  |
Total gross carrying amount | $ 4,400,000 |  |

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