Related Party Transactions	12 Months Ended
Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	RELATED PARTY TRANSACTIONS In February 2013, we entered into an R&D collaboration agreement with BIO-key International, Inc. ("BIO-key"), and made a direct investment in the company. The R&D collaboration will target advanced Cloud security and identity and access management solutions for the mobile market. As part of the agreement, we acquired approximately 4.0 million shares of BIO-key which were initially valued at $0.5 million. During 2014, we sold approximately 1.4 million of such shares, which had been initially valued at approximately $0.2 million. In 2014 and 2013, we paid zero and less than $0.1 million, respectively, to BIO-key in relation to the collaboration agreement previously discussed. On September 17, 2013, InterDigital announced that it had entered into a development agreement with a wholly owned subsidiary of DDD Group plc ("DDD") regarding its next generation HD and UHD video processing technologies. Under the terms of the development agreement, DDD and InterDigital will collaborate to combine DDD's new image processing techniques with InterDigital's user adaptive video streaming technology to explore the feasibility of the combined solution for applications in streaming video to mobile devices and Smart TVs. As part of the agreement, we acquired approximately 7.0 million shares of DDD which were initially valued at $0.9 million. In 2014 and 2013, we paid zero to DDD in relation to the development agreement previously discussed.

Related Party Transactions

12 Months Ended

Dec. 31, 2014

RELATED PARTY TRANSACTIONS

In February 2013, we entered into an R&D collaboration agreement with BIO-key International, Inc. ("BIO-key"), and made a direct investment in the company. The R&D collaboration will target advanced Cloud security and identity and access management solutions for the mobile market. As part of the agreement, we acquired approximately 4.0 million shares of BIO-key which were initially valued at $0.5 million. During 2014, we sold approximately 1.4 million of such shares, which had been initially valued at approximately $0.2 million. In 2014 and 2013, we paid zero and less than $0.1 million, respectively, to BIO-key in relation to the collaboration agreement previously discussed.

On September 17, 2013, InterDigital announced that it had entered into a development agreement with a wholly owned subsidiary of DDD Group plc ("DDD") regarding its next generation HD and UHD video processing technologies. Under the terms of the development agreement, DDD and InterDigital will collaborate to combine DDD's new image processing techniques with InterDigital's user adaptive video streaming technology to explore the feasibility of the combined solution for applications in streaming video to mobile devices and Smart TVs. As part of the agreement, we acquired approximately 7.0 million shares of DDD which were initially valued at $0.9 million. In 2014 and 2013, we paid zero to DDD in relation to the development agreement previously discussed.