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Income from patent arrangement
9 Months Ended
Sep. 30, 2017
Income From Patent Arrangement [Abstract]  
Income from patent arrangement
K) Income from patent arrangement. We entered into an arrangement with an unaffiliated third party in 2010 under which we assigned certain patents in return for royalties on proceeds from patent monetization efforts by the third party. The third party has engaged in various patent monetization activities, including enforcement, litigation and licensing. In the three and nine months ended September 30, 2017, the third party reported and we recorded $19,000 and $1.4 million, respectively, of income from this arrangement. In the three and nine months ended September 30, 2016, the third party reported and we recorded $238,000 of income from this arrangement.