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Retirement Plan
12 Months Ended
Dec. 31, 2012
Retirement Plan [Abstract]  
Retirement plan
12. Retirement plan:

The Company sponsors a defined contribution retirement plan under Section 401(k) of the Internal Revenue Code. The plan covers all employees who meet certain eligibility and participation requirements. Participants may contribute up to 90% of their eligible earnings, as limited by law. The Company makes a matching contribution equal to 100% on the first 5% of participant contributions to the plan. The Company made contributions of approximately $0.1 million in 2012, 2011 and 2010.