Roku (ROKU) stock fell more than 10% in after-hours trading on Wednesday after the company's Q4 guidance disappointed, despite the media player reporting its first quarter of $1 billion in revenue. For the current quarter, the company estimated gross profit to hit $465 million, with adjusted EBITDA expected to clock in at $30 million. Both metrics fell below Wall Street expectations of $477 million in gross profit and $36.2 million in adjusted EBITDA. The company also said it will stop reportin...