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Employee benefit plans
12 Months Ended
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Pension and other postretirement benefits disclosure

13. Employee benefit plans:

The Company sponsors a 401(k) defined contribution plan covering all employees meeting certain eligibility requirements. Contributions made by the Company are determined annually by the Board of Directors. To date, the Company has made no contributions to this plan.