Just looking at some of the retracements over the last couple of months, I don't think there is anything to be worried about just yet.
Mid September 30c to 22.5c (7.5c or 25%)
Mid November 34c to 29c (5c or 14.7%)
Late November 39.5 to 35c (4.5c or 11.4%)
So from 66.5c a retracement back to 58.5c doesnt appear that bad (8c or 12%)
A retracement of 25% as experienced in September would equate to a share price of about 50c. Anything under 50c, indicates to me that there could be a concern.
SDL Price at posting:
59.5¢ Sentiment: None Disclosure: Held