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Recent Accounting Pronouncements (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] | The cumulative effect of applying the new revenue standard, primarily relating to financing components of contracts executed in prior periods and estimates of variable consideration for sales and usage based royalty agreements executed in prior periods, was as follows (in thousands):
|  | Balance at December 31, 2017 |  | Adjustments Due to ASC 606 |  | Balance at January 1, 2018
Balance Sheets: |  |  |  |  |  |
Accounts receivable |  | $ | 153 |  |  | $ | 4,542 |  |  | $ | 4,695 |
Royalties and contingent legal fees payable |  | 1,601 |  |  | 1,728 |  |  | 3,329 |
Accumulated deficit |  | (320,018 | ) |  | 2,506 |  |  | (317,512 | )
Noncontrolling interests |  | 1,358 |  |  | 308 |  |  | 1,666 |
Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block] | The impact of the adoption of the new accounting standard on the condensed consolidated balance sheet and statement of operations was as follows (in thousands):
|  | December 31, 2018
|  | Balance as Reported |  | Balance under Legacy GAAP |  | Effect of Change
Balance Sheets: |  |  |  |  |  |
Accounts receivable |  | $ | 32,884 |  |  | $ | 28,500 |  |  | $ | 4,384 |
Royalties and contingent legal fees payable |  | 22,688 |  |  | 20,404 |  |  | 2,284 |
|  | Year Ended December 31, 2018
|  | Balance as Reported |  | Balance under Legacy GAAP |  | Effect of Change
Statements of Operations: |  |  |  |  |  |
Revenues |  | $ | 131,506 |  |  | $ | 131,723 |  |  | $ | 217 |
Inventor royalties |  | $ | 35,168 |  |  | $ | 34,295 |  |  | $ | (873 | )
Contingent legal fees |  | $ | 31,501 |  |  | $ | 32,020 |  |  | $ | 519 |

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- Definition Tabular disclosure of the comparison between amounts disclosed under previous guidance and new guidance. + References No definition available. + Details
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