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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | $ 32,884 |  |  |  | $ 153 |  |  |  | $ 32,884 | $ 153 |
Revenues | 49,203 | $ 13,725 | $ 6,485 | $ 62,093 | 3,458 | $ 36,633 | $ 16,457 | $ 8,854 | 131,506 | 65,402 |
Inventor royalties | 11,002 | 1,181 | 1,241 | 21,744 | 13 | 0 | 4,273 | 666 | 35,168 | 4,952 |
Contingent legal fees | 11,756 | $ 2,949 | $ 1,037 | $ 15,759 | 646 | $ 12,173 | $ 3,236 | $ 627 | 31,501 | 16,682 |
Accounts receivable |  |  |  |  | 153 |  |  |  |  | 153 | $ 4,695
Royalties and contingent legal fees payable | 22,688 |  |  |  | 1,601 |  |  |  | 22,688 | 1,601 | 3,329
Accumulated deficit | (422,541) |  |  |  | (320,018) |  |  |  | (422,541) | (320,018) | (317,512)
Noncontrolling interests |  |  |  |  | $ 1,358 |  |  |  |  | $ 1,358 | 1,666
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 217 |  |
Inventor royalties |  |  |  |  |  |  |  |  | (873) |  |
Contingent legal fees |  |  |  |  |  |  |  |  | 519 |  |
Accounts receivable | 4,384 |  |  |  |  |  |  |  | 4,384 |  |
Royalties and contingent legal fees payable | 2,284 |  |  |  |  |  |  |  | 2,284 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 131,723 |  |
Inventor royalties |  |  |  |  |  |  |  |  | 34,295 |  |
Contingent legal fees |  |  |  |  |  |  |  |  | 32,020 |  |
Accounts receivable | 28,500 |  |  |  |  |  |  |  | 28,500 |  |
Royalties and contingent legal fees payable | $ 20,404 |  |  |  |  |  |  |  | $ 20,404 |  |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  |  | 4,542
Royalties and contingent legal fees payable |  |  |  |  |  |  |  |  |  |  | 1,728
Accumulated deficit |  |  |  |  |  |  |  |  |  |  | 2,506
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  | $ 308

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