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Subsequent Event	3 Months Ended
	Jun. 30, 2011
Subsequent Event	16. Subsequent Event On July 5, 2011, Repligen Corporation (the “Company”) and TC Saracen, LLC (the “Landlord”) entered into a First Amendment to Lease (the “Amendment”) to the lease agreement dated October 10, 2001, as amended, for the leased premises located at 41 Seyon Street, Waltham, Massachusetts. This facility currently serves as the corporate headquarters for the Company and primary location for all manufacturing, research and development, sales and marketing and administrative operations. Under terms of the Amendment, the Company and Landlord have mutually agreed to expand the leased premises within this facility and likewise extend the term by eleven years, which, depending on the commencement date of the Company’s occupancy of the expanded premises, should expire on or about May 31, 2023. Annual rent for the leased premises begins at $17.36 per rentable square foot for the first six years, and increases to $20.22 for years seven through eleven. The Company will receive a Tenant Improvement Allowance of up to $1.77 million from Landlord to help fund leasehold improvements. The Company also has certain termination rights as described within the Amendment, most notably in the event of Landlord’s inability to deliver the expansion space in a timely manner.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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