FISH: You are incorrect as far as IDCC's investment in Hillcrest. While IDCC may not have realized all the benefits they anticipated, they actually made a profit on the sale. According to the latest 10-K:
"Hillcrest Product Business
On December 20, 2016, we acquired Hillcrest Laboratories, Inc. ("Hillcrest"), a pioneer in sensor processing technology, for approximately $48.0 million in cash, net of $0.4 million cash acquired. The business combination transaction was accounted for using the acquisition method of accounting.
On July 19, 2019, we completed the sale of Hillcrest's product business to a subsidiary of CEVA, Inc. In connection with the sale, we received initial proceeds of $10.0 million, with a customary portion of the purchase price placed in escrow to secure potential indemnification claims. As part of the transaction, we retained substantially all of the Hillcrest patent assets that we acquired in 2016. As a result of this transaction, we recorded an $8.5 million gain on sale which is included within "Other Income, Net" in the consolidated statements of income for the year ended December 31, 2019."
As far as other investments, again according to the 10-K:
"The carrying value of our investments in other entities are included within "Other Non-Current Assets" on our consolidated balance sheets. During 2020, 2019 and 2018, we made investments in other entities of $0.2 million, $0.4 million and $6.7 million, respectively. The carrying value of our investments in other entities as of December 31, 2020 and 2019 was $15.5 million and $14.2 million, respectively, the majority of which are accounted for under the measurement alternative for equity investments described above."
If you go back in history, IDCC in 2013 wrote off their $21.7 million investment in Pantech; while in 2011/2012 they wrote off their $5.7 million investment in Kineto Wireless, andd their $0.7 million investment in Attila Technologies.
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