Related Party Transactions (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Street Capital [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Description of Transaction	Beginning in 2004, HGI and Street Capital entered into successive annual management services agreements (collectively, the “Agreement”). Under the terms of the Agreement, HGI agreed to pay Street Capital for ongoing services provided to HGI by Street Capital personnel. These services included preparation of the Company’s financial statements and regulatory filings, taxation matters, stock-based compensation administration, Board administration, patent portfolio administration and litigation matters. In 2013, Street Capital announced its plan to dispose of its interest in HGI, and on March 20, 2014, Street Capital declared a dividend in kind, consisting of Street Capital’s distribution of its majority interest in HGI to Street Capital shareholders. The dividend was paid on April 30, 2014 to shareholders of record as of April 1, 2014. Following this disposition, the Company and Street Capital entered into a replacement management services agreement (the “Services Agreement”). Under the terms of the Services Agreement, Street Capital remained as external manager and continued to provide the same services, at similar rates, until the Services Agreement was terminated effective August 31, 2015, as described more fully in the Current Report on Form 8-K filed with the SEC on September 1, 2015.
David Ludwig [Member]
Related Party Transaction [Line Items]
Second earn-out provision payment	$ 0.8
Street Capital Loan [Member]
Related Party Transaction [Line Items]
Related Party Accrued Interest	0.5
Related party debt	$ 1.0	$ 1.7