No that's the current amount that is short. The past months don't add to this. days on the threshhold means how many day it's been on the SHO list and has failed to delivers. http://www.nasdaqtrader.com/aspx/regsho.aspx
buyin imminent refers to being on the list for 13 days.
"Additional delivery or close-out requirements on designated "threshold securities." A threshold security means an equity security registered or required to file reports with the Commission for which there is an aggregate fail to deliver position for five consecutive settlement days at a registered clearing agency of 10,000 shares or more and that is equal to at least 0.5% of the issue's total shares outstanding. Where a clearing agency participant has a fail to deliver position in threshold securities that persists for 13 consecutive settlement days, the participant must take action to close out the position. Until the position is closed out, the participant, and any broker-dealer for which it clears transactions, including market makers, may not effect further short sales in the particular threshold security without borrowing or entering into a bona fide arrangement to borrow the security." http://www.sec.gov/news/press/2007/2007-114.htm
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