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Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax | $ 59,947 | $ 57,399 | $ 58,297 | $ 48,384 | $ 68,563 | $ 59,754 | $ 56,458 | $ 46,426 | $ 224,027 | $ 231,201 | $ 393,096
Unbilled receivables | 528,069 |  |  |  | 673,616 |  |  |  | 528,069 | 673,616 |
Deferred revenue | 11,947 |  |  |  | $ 19,566 |  |  |  | 11,947 | 19,566 |
Contract balances, revenue recognized |  |  |  |  |  |  |  |  | 18,300 | $ 20,500 |
Remaining performance obligations | $ 22,000 |  |  |  |  |  |  |  | $ 22,000 |  |
Remaining performance obligations, expected timing of satisfaction period | 2 years |  |  |  |  |  |  |  | 2 years |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
License agreement, term of agreement |  |  |  |  |  |  |  |  | 1 year |  |
Long-duration contracts, assumptions by product and guarantee, discount rate | 3.00% |  |  |  |  |  |  |  | 3.00% |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
License agreement, term of agreement |  |  |  |  |  |  |  |  | 7 years |  |
Long-duration contracts, assumptions by product and guarantee, discount rate | 6.00% |  |  |  |  |  |  |  | 6.00% |  |
Percentage of Completion [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | $ 28,000 |  |

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