It must stay above 1 for at least 10 consecutive trading days in order to stave off a delisting notice and/or actual delisting.
The process is quite lengthy and at the present CPST is in no danger of delisting. However, it needs to get above 1 soon or they will receive the notification on non-compliance which starts the ball rolling.
I went back and reviewed NEXM. They received notice from nasdaq because they failed to meet the $1 closing bid price for 10 consecutive days tading during the last 180 days. Nexm then applied to move to the less stringent nasdaq capital markets. That gave Nexm another 180 days to comply with the $1 rule. Which they did. So CPST still has lots of time to get it right