Acquisitions of Ownership Interests in Partner Companies and Funds	9 Months Ended
Sep. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]
Acquisitions of Ownership Interests in Partner Companies and Funds	Acquisitions of Ownership Interests in Partner Companies and Funds In September and June 2013, the Company funded an aggregate of $0.6 million of convertible bridge loans to Alverix, Inc. (“Alverix”). The Company had previously deployed an aggregate of $8.8 million in Alverix. Alverix provides next-generation instrument and connectivity platforms for diagnostic Point-of-Care testing. The Company accounts for its interest in Alverix under the equity method. In August 2013, the Company acquired a 34.4% primary ownership interest in Quantia, Inc. ("Quantia") for $7.5 million. Quantia provides a mobile and web-based physician relationship management platform, QuantiaMD, which enables principal participants throughout the healthcare spectrum, including health systems, payers, pharmaceutical companies and medical device companies, to engage and interact with their physicians. The Company accounts for its interest in Quantia under the equity method. The difference between the Company's cost and its interest in the underlying net assets of Quantia was preliminarily allocated to intangible assets and goodwill as reflected in the carrying value in Ownership interests in and advances to partner companies and funds on the Consolidated Balance Sheets. In August 2013, the Company deployed an additional $1.1 million into DriveFactor, Inc. ("DriveFactor"). The Company previously deployed an aggregate of $3.5 million in DriveFactor. DriveFactor is a provider of telematics technology and statistical analysis of driving data. The Company accounts for its interest in DriveFactor under the equity method. The difference between the Company’s cost and its interest in the underlying net assets of DriveFactor was allocated to goodwill as reflected in the carrying value in Ownership interests in and advances to partner companies and funds on the Consolidated Balance Sheets. In August 2013, the Company deployed $5.0 million in Clutch Holdings, Inc. (“Clutch”). The Company previously had acquired an interest in Clutch in February 2013 for $0.5 million. In conjunction with the most recent funding, the Company’s primary ownership interest in Clutch increased from 6.5% to 24.0%, above the threshold at which the Company believes it exercises significant influence. Accordingly, the Company adopted the equity method of accounting for its holdings in Clutch. The difference between the Company's cost and its interest in the underlying net assets of Clutch was preliminarily allocated to intangible assets and goodwill as reflected in the carrying value in Ownership interests in and advances to partner companies and funds on the Consolidated Balance Sheets. The change in accounting treatment for the Company’s holdings in Clutch from the cost method to the equity method had no effect on the Consolidated Financial Statements of any prior period. Clutch is a mobile commerce platform that unifies applications associated with gifting, loyalty and shopping programs to improve the customer experience. In July 2013, the Company funded $1.0 million of a convertible bridge loan to Crescendo Bioscience, Inc. (“Crescendo Bioscience”). The Company previously had acquired an interest in Crescendo Bioscience in December 2012 for $10.0 million. Crescendo Bioscience is a molecular diagnostics laboratory focused on rheumatology. The Company accounts for its ownership interest in Crescendo Bioscience under the cost method. During the nine months ended September 30, 2013, the Company funded $2.3 million for participations in loan and equity interests initiated by Penn Mezzanine. Included in this funding were $2.2 million for participation in a loan and $0.1 million for participation in equity of the borrower acquired by Penn Mezzanine. During the nine months ended September 30, 2013, the Company funded an aggregate of $5.3 million of a convertible bridge loan to PixelOptics. The Company previously deployed an aggregate of $31.6 million in PixelOptics. PixelOptics provides electronic corrective eyeglasses designed to substantially reduce or eliminate the visual distortion and other limitations associated with multifocal lenses. The Company accounts for its interest in PixelOptics under the equity method. As previously noted, the adjusted carrying value of PixelOptics at September 30, 2013 was $0. In June 2013, the Company deployed an additional $5.3 million into Medivo, Inc. (“Medivo”). The Company had previously acquired an interest in Medivo in November 2011 for $6.3 million. Medivo is a cloud-based health monitoring platform that connects doctors, consumers and clinical labs. The Company accounts for its interest in Medivo under the equity method. With respect to the June 2013 deployment, the difference between the Company’s cost and its incremental interest in the underlying net assets of Medivo was preliminarily allocated to intangible assets and goodwill as reflected in the carrying value in Ownership interests in and advances to partner companies and funds on the Consolidated Balance Sheets. In May 2013, the Company funded $0.2 million of a convertible bridge loan to Hoopla Software, Inc. (“Hoopla”). The Company had previously acquired an interest in Hoopla in December 2011 for $1.3 million. Hoopla helps organizations create high performance sales cultures through software-as-a-service solutions that integrate with customer relationship management systems. The Company accounts for its interest in Hoopla under the equity method. In March 2013, the Company deployed an additional $1.7 million into Lumesis, Inc. (“Lumesis”). The Company had previously acquired an interest in Lumesis in February 2012 for $2.2 million. Lumesis is a financial technology company that is dedicated to delivering software solutions and comprehensive, timely data to the municipal bond marketplace. The Company accounts for its interest in Lumesis under the equity method. The difference between the Company’s cost and its interest in the underlying net assets of Lumesis was preliminarily allocated to intangible assets and goodwill as reflected in the carrying value in Ownership interests in and advances to partner companies and funds on the Consolidated Balance Sheets. In February 2013, the Company acquired a 27.6% primary ownership interest in Pneuron Corporation (“Pneuron”) for $5.0 million. Pneuron helps enterprise companies reduce the time and cost of application development by building solutions across heterogeneous databases and applications. The Company accounts for its ownership interest in Pneuron under the equity method. The difference between the Company’s cost and its interest in the underlying net assets of Pneuron was preliminarily allocated to intangible assets and goodwill as reflected in the carrying value in Ownership interests in and advances to partner companies and funds on the Consolidated Balance Sheets. In January 2013, the Company acquired a 7.7% primary interest in Sotera Wireless, Inc. (“Sotera Wireless”). The Company deployed $1.3 million into Sotera Wireless and acquired additional shares from a previous investor for $1.2 million. Sotera Wireless is a medical device company that has developed a wireless patient monitoring platform that is designed to keep clinicians connected to their patients. The Company accounts for its interest in Sotera Wireless under the cost method.

Acquisitions of Ownership Interests in Partner Companies and Funds

In September and June 2013, the Company funded an aggregate of $0.6 million of convertible bridge loans to Alverix, Inc. (“Alverix”). The Company had previously deployed an aggregate of $8.8 million in Alverix. Alverix provides next-generation instrument and connectivity platforms for diagnostic Point-of-Care testing. The Company accounts for its interest in Alverix under the equity method.

In August 2013, the Company acquired a 34.4% primary ownership interest in Quantia, Inc. ("Quantia") for $7.5 million. Quantia provides a mobile and web-based physician relationship management platform, QuantiaMD, which enables principal participants throughout the healthcare spectrum, including health systems, payers, pharmaceutical companies and medical device companies, to engage and interact with their physicians. The Company accounts for its interest in Quantia under the equity method. The difference between the Company's cost and its interest in the underlying net assets of Quantia was preliminarily allocated to intangible assets and goodwill as reflected in the carrying value in Ownership interests in and advances to partner companies and funds on the Consolidated Balance Sheets.

In August 2013, the Company deployed an additional $1.1 million into DriveFactor, Inc. ("DriveFactor"). The Company previously deployed an aggregate of $3.5 million in DriveFactor. DriveFactor is a provider of telematics technology and statistical analysis of driving data. The Company accounts for its interest in DriveFactor under the equity method. The difference between the Company’s cost and its interest in the underlying net assets of DriveFactor was allocated to goodwill as reflected in the carrying value in Ownership interests in and advances to partner companies and funds on the Consolidated Balance Sheets.

In August 2013, the Company deployed $5.0 million in Clutch Holdings, Inc. (“Clutch”). The Company previously had acquired an interest in Clutch in February 2013 for $0.5 million. In conjunction with the most recent funding, the Company’s primary ownership interest in Clutch increased from 6.5% to 24.0%, above the threshold at which the Company believes it exercises significant influence. Accordingly, the Company adopted the equity method of accounting for its holdings in Clutch. The difference between the Company's cost and its interest in the underlying net assets of Clutch was preliminarily allocated to intangible assets and goodwill as reflected in the carrying value in Ownership interests in and advances to partner companies and funds on the Consolidated Balance Sheets. The change in accounting treatment for the Company’s holdings in Clutch from the cost method to the equity method had no effect on the Consolidated Financial Statements of any prior period. Clutch is a mobile commerce platform that unifies applications associated with gifting, loyalty and shopping programs to improve the customer experience.

In July 2013, the Company funded $1.0 million of a convertible bridge loan to Crescendo Bioscience, Inc. (“Crescendo Bioscience”). The Company previously had acquired an interest in Crescendo Bioscience in December 2012 for $10.0 million. Crescendo Bioscience is a molecular diagnostics laboratory focused on rheumatology. The Company accounts for its ownership interest in Crescendo Bioscience under the cost method.

During the nine months ended September 30, 2013, the Company funded $2.3 million for participations in loan and equity interests initiated by Penn Mezzanine. Included in this funding were $2.2 million for participation in a loan and $0.1 million for participation in equity of the borrower acquired by Penn Mezzanine.

During the nine months ended September 30, 2013, the Company funded an aggregate of $5.3 million of a convertible bridge loan to PixelOptics. The Company previously deployed an aggregate of $31.6 million in PixelOptics. PixelOptics provides electronic corrective eyeglasses designed to substantially reduce or eliminate the visual distortion and other limitations associated with multifocal lenses. The Company accounts for its interest in PixelOptics under the equity method. As previously noted, the adjusted carrying value of PixelOptics at September 30, 2013 was $0.

In June 2013, the Company deployed an additional $5.3 million into Medivo, Inc. (“Medivo”). The Company had previously acquired an interest in Medivo in November 2011 for $6.3 million. Medivo is a cloud-based health monitoring platform that connects doctors, consumers and clinical labs. The Company accounts for its interest in Medivo under the equity method. With respect to the June 2013 deployment, the difference between the Company’s cost and its incremental interest in the underlying net assets of Medivo was preliminarily allocated to intangible assets and goodwill as reflected in the carrying value in Ownership interests in and advances to partner companies and funds on the Consolidated Balance Sheets.

In May 2013, the Company funded $0.2 million of a convertible bridge loan to Hoopla Software, Inc. (“Hoopla”). The Company had previously acquired an interest in Hoopla in December 2011 for $1.3 million. Hoopla helps organizations create high performance sales cultures through software-as-a-service solutions that integrate with customer relationship management systems. The Company accounts for its interest in Hoopla under the equity method.

In March 2013, the Company deployed an additional $1.7 million into Lumesis, Inc. (“Lumesis”). The Company had previously acquired an interest in Lumesis in February 2012 for $2.2 million. Lumesis is a financial technology company that is dedicated to delivering software solutions and comprehensive, timely data to the municipal bond marketplace. The Company accounts for its interest in Lumesis under the equity method. The difference between the Company’s cost and its interest in the underlying net assets of Lumesis was preliminarily allocated to intangible assets and goodwill as reflected in the carrying value in Ownership interests in and advances to partner companies and funds on the Consolidated Balance Sheets.

In February 2013, the Company acquired a 27.6% primary ownership interest in Pneuron Corporation (“Pneuron”) for $5.0 million. Pneuron helps enterprise companies reduce the time and cost of application development by building solutions across heterogeneous databases and applications. The Company accounts for its ownership interest in Pneuron under the equity method. The difference between the Company’s cost and its interest in the underlying net assets of Pneuron was preliminarily allocated to intangible assets and goodwill as reflected in the carrying value in Ownership interests in and advances to partner companies and funds on the Consolidated Balance Sheets.

In January 2013, the Company acquired a 7.7% primary interest in Sotera Wireless, Inc. (“Sotera Wireless”). The Company deployed $1.3 million into Sotera Wireless and acquired additional shares from a previous investor for $1.2 million. Sotera Wireless is a medical device company that has developed a wireless patient monitoring platform that is designed to keep clinicians connected to their patients. The Company accounts for its interest in Sotera Wireless under the cost method.