Leases	9 Months Ended
Sep. 30, 2013
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	Leases In April 2013, the Company entered into a new lease agreement for additional laboratory and office space to be constructed in two new buildings (the "Buildings"), which are expected to be completed in late 2015, at the Company's current Tarrytown, New York location. The initial term of the lease, which is expected to commence in mid-2014, is approximately 15 years and contains three renewal options to extend the term of the lease by five years each. The lease provides for (i) monthly payments over its term, which will be based on the landlord's costs of construction and tenant allowances, and (ii) additional charges for utilities, taxes, and operating expenses. Based upon various factors, including the Company's involvement in the Buildings' construction and its responsibility for directly paying for a substantial portion of tenant improvements, the Company is deemed, in substance, to be the owner of the landlord's Buildings in accordance with the application of FASB authoritative guidance. Consequently, in addition to capitalizing the tenant improvements, the Company capitalizes the landlord's costs of constructing these new facilities, offset by a corresponding lease obligation on the Company's balance sheet. The Company will allocate a portion of its future lease payments to the Buildings and the land on which the Buildings are being constructed. The land element of the lease is treated for accounting purposes as an operating lease. Commencing in the second quarter of 2013, the Company began capitalizing the landlord's costs of constructing the new Buildings, which totaled $7.7 million at September 30, 2013, and recognized a corresponding facility lease obligation of $7.7 million. Such amounts were included as a non-cash activity within the Company's Condensed Consolidated Statements of Cash Flows. Rent expense in connection with the land element of these new facilities commenced in April 2013 and is recorded as a deferred liability until lease payments commence in mid-2014. In April 2013, the Company also executed an early renewal of certain laboratory and office space that it currently leases at its Tarrytown location. The early renewal extended the term of the lease from June 2024 to June 2029.

Leases

9 Months Ended

Sep. 30, 2013

Leases of Lessee Disclosure [Text Block]

Leases

In April 2013, the Company entered into a new lease agreement for additional laboratory and office space to be constructed in two new buildings (the "Buildings"), which are expected to be completed in late 2015, at the Company's current Tarrytown, New York location. The initial term of the lease, which is expected to commence in mid-2014, is approximately 15 years and contains three renewal options to extend the term of the lease by five years each. The lease provides for (i) monthly payments over its term, which will be based on the landlord's costs of construction and tenant allowances, and (ii) additional charges for utilities, taxes, and operating expenses. Based upon various factors, including the Company's involvement in the Buildings' construction and its responsibility for directly paying for a substantial portion of tenant improvements, the Company is deemed, in substance, to be the owner of the landlord's Buildings in accordance with the application of FASB authoritative guidance. Consequently, in addition to capitalizing the tenant improvements, the Company capitalizes the landlord's costs of constructing these new facilities, offset by a corresponding lease obligation on the Company's balance sheet. The Company will allocate a portion of its future lease payments to the Buildings and the land on which the Buildings are being constructed. The land element of the lease is treated for accounting purposes as an operating lease.

Commencing in the second quarter of 2013, the Company began capitalizing the landlord's costs of constructing the new Buildings, which totaled $7.7 million at September 30, 2013, and recognized a corresponding facility lease obligation of $7.7 million. Such amounts were included as a non-cash activity within the Company's Condensed Consolidated Statements of Cash Flows. Rent expense in connection with the land element of these new facilities commenced in April 2013 and is recorded as a deferred liability until lease payments commence in mid-2014.

In April 2013, the Company also executed an early renewal of certain laboratory and office space that it currently leases at its Tarrytown location. The early renewal extended the term of the lease from June 2024 to June 2029.