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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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