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Acquisitions Acquisition (Purchase Price Allocation) (Details) - USD ($) $ in Thousands | Aug. 23, 2019 | Dec. 31, 2019 | Dec. 08, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 183,465 |  | $ 207,178 | $ 209,661
Northwest Logic |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Preliminary purchase price allocation adjustment, goodwill | $ 2,100 |  |  |  |
Preliminary purchase price allocation adjustment, deferred tax liability | 2,100 |  |  |  |
Cash and cash equivalents | 159 |  |  |  |
Accounts receivable | 1,679 |  |  |  |
Prepaid expenses and other current assets | 65 |  |  |  |
Operating lease right-of-use assets | 178 |  |  |  |
Identified intangible assets | 8,800 |  |  |  |
Goodwill | 13,477 |  |  |  |
Other asset | 9 |  |  |  |
Accounts payable | (9) |  |  |  |
Operating lease liability | (178) |  |  |  |
Other current liabilities | (108) |  |  |  |
Deferred tax liability, net | (2,133) |  |  |  |
Recognized identifiable assets acquired and liabilities assumed, net | $ 21,939 |  |  |  |
Silicon IP and Business Protocols Business from Verimatrix |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Prepaid expenses and other current assets |  |  | $ 267 |  |
Unbilled receivables |  |  | 6,765 |  |
Operating lease right-of-use assets |  |  | 852 |  |
Identified intangible assets |  |  | 23,500 |  |
Goodwill |  |  | 16,845 |  |
Deferred revenue |  |  | (310) |  |
Operating lease liability |  |  | (852) |  |
Other current liabilities |  |  | (267) |  |
Recognized identifiable assets acquired and liabilities assumed, net |  |  | $ 46,800 |  |

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