Acquisitions of Ownership Interests in Partner Companies and Funds	3 Months Ended
Mar. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Acquisitions of Ownership Interests in Partner Companies	Acquisitions of Ownership Interests in Partner Companies First quarter of 2018 The Company funded an aggregate of $1.3 million of convertible loans to NovaSom, Inc. The Company had previously deployed an aggregate of $24.1 million in NovaSom. NovaSom is a medical device company focused on obstructive sleep apnea, specifically home testing with its FDA-cleared wireless device called AccuSom^® home sleep test. The Company accounts for its interest in NovaSom under the equity method. The Company funded an aggregate of $0.8 million of convertible bridge loans to InfoBionic, Inc. The Company had previously deployed an aggregate of $19.7 million in InfoBionic. InfoBionic is an emerging digital health company focused on creating patient monitoring solutions for chronic disease management with an initial market focus on cardiac arrhythmias. The Company accounts for its interest in InfoBionic under the equity method. The Company funded an aggregate of $0.5 million of convertible bridge loans to Spongecell, Inc. The Company had previously deployed an aggregate of $18.6 million in Spongecell. In the first quarter of 2018, Spongecell merged into Flashtalking. The Company previously accounted for its interest in Spongecell under the equity method. The Company funded an aggregate of $0.5 million of convertible bridge loans to WebLinc, Inc. The Company had previously deployed an aggregate of $14.0 million in WebLinc. WebLinc is a commerce platform and services provider for fast growing online retailers. The Company accounts for its interest in WebLinc under the equity method. The Company funded an aggregate of $0.4 million of convertible bridge loans to Brickwork. The Company had previously deployed an aggregate of $4.2 million in Brickwork. Brickwork helps retailers inform, target, convert, and prepare for store shoppers online as the first scalable software-as-a-service platform powering a seamless customer path between online and in-store shopping. The Company accounts for its interest in Brickwork under the equity method. The Company funded an aggregate of $0.3 million of convertible bridge loans to Cask Data, Inc. The Company had previously deployed an aggregate of $13.0 million in Cask Data. Cask Data makes building and running big data solutions on-premises or in the cloud easy with Cask Data Application Platform. The Company accounts for its interest in Cask Data under the equity method. The Company funded an aggregate of $0.2 million of a convertible bridge loan to Sonobi, Inc. The Company had previously deployed $9.2 million in Sonobi. Sonobi is an advertising technology developer that designs advertising tools and solutions for the industry's leading media, publishers, brand advertisers, media agencies, DSPs, and media technology providers. The Company accounts for its interest in Sonobi under the equity method.

Acquisitions of Ownership Interests in Partner Companies

First quarter of 2018

The Company funded an aggregate of $1.3 million of convertible loans to NovaSom, Inc. The Company had previously deployed an aggregate of $24.1 million in NovaSom. NovaSom is a medical device company focused on obstructive sleep apnea, specifically home testing with its FDA-cleared wireless device called AccuSom^® home sleep test. The Company accounts for its interest in NovaSom under the equity method.

The Company funded an aggregate of $0.8 million of convertible bridge loans to InfoBionic, Inc. The Company had previously deployed an aggregate of $19.7 million in InfoBionic. InfoBionic is an emerging digital health company focused on creating patient monitoring solutions for chronic disease management with an initial market focus on cardiac arrhythmias. The Company accounts for its interest in InfoBionic under the equity method.

The Company funded an aggregate of $0.5 million of convertible bridge loans to Spongecell, Inc. The Company had previously deployed an aggregate of $18.6 million in Spongecell. In the first quarter of 2018, Spongecell merged into Flashtalking. The Company previously accounted for its interest in Spongecell under the equity method.

The Company funded an aggregate of $0.5 million of convertible bridge loans to WebLinc, Inc. The Company had previously deployed an aggregate of $14.0 million in WebLinc. WebLinc is a commerce platform and services provider for fast growing online retailers. The Company accounts for its interest in WebLinc under the equity method.

The Company funded an aggregate of $0.4 million of convertible bridge loans to Brickwork. The Company had previously deployed an aggregate of $4.2 million in Brickwork. Brickwork helps retailers inform, target, convert, and prepare for store shoppers online as the first scalable software-as-a-service platform powering a seamless customer path between online and in-store shopping. The Company accounts for its interest in Brickwork under the equity method.

The Company funded an aggregate of $0.3 million of convertible bridge loans to Cask Data, Inc. The Company had previously deployed an aggregate of $13.0 million in Cask Data. Cask Data makes building and running big data solutions on-premises or in the cloud easy with Cask Data Application Platform. The Company accounts for its interest in Cask Data under the equity method.

The Company funded an aggregate of $0.2 million of a convertible bridge loan to Sonobi, Inc. The Company had previously deployed $9.2 million in Sonobi. Sonobi is an advertising technology developer that designs advertising tools and solutions for the industry's leading media, publishers, brand advertisers, media agencies, DSPs, and media technology providers. The Company accounts for its interest in Sonobi under the equity method.