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Variable Interest Entities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) variable_interest_entity | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2013 patent
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Variable interest entities assets | $ 41,300 |  |  |  |  | $ 41,300 |  | $ 29,900 |
Variable interest entities liabilities | 3,800 |  |  |  |  | 3,800 |  | 6,100 |
Noncontrolling interests | (1,399) | $ (1,411) | $ (1,642) | $ (1,190) | $ (1,501) | (4,175) | $ (4,333) |  |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Variable interest entities assets | 20,800 |  |  |  |  | 20,800 |  | 11,700 |
Accounts Receivable |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Variable interest entities assets | 1,500 |  |  |  |  | 1,500 |  | 1,300 |
Patents |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Variable interest entities assets | 17,700 |  |  |  |  | 17,700 |  | 14,400 |
Other Noncurrent Assets |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Variable interest entities assets | 1,300 |  |  |  |  | 1,300 |  | $ 2,500 |
Chordant |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling interests | 500 |  |  |  |  | 1,200 |  |  |
Convida |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling interests | $ 900 |  |  |  |  | $ 3,000 |  |  |
Primary Beneficiary |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Number of variable interest entities | variable_interest_entity |  |  |  |  |  | 3 |  |  |
Number of patents (more than) | patent |  |  |  |  |  |  |  |  | 500

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