iRobot filed for bankruptcy this week, sending the stock into freefall. Short-seller Spruce Point Capital had been betting against the Roomba maker since 2014. The firm's founder shared his thoughts on identifying short targets with Business Insider. The maker of the Roomba robot vacuum filed for bankruptcy this week, but to one short-seller, the decline has been a decade in the making. As early as last week, iRobot was the talk of the retail crowd after a 70% surge in a matter of days led to spe ...