OK, I looked at it and...

The revolving credit facility has sublimits for swing line loans up to $10.0 million and for the issuance of standby letters of credit in a face amount up to $25.0 million. There are approximately $4.5 million in letters of credit outstanding under the Credit Agreement.

Letters of Credit are used in trade finance to pay (and/or guarentee payment) to suppliers. Could have something to do with paying for services on implementations, and /or also with expansion to build out a new overseas facility.