Fair Value Measurements (Impairment) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of capitalized software development costs	$ 2,600,000	$ 635,000
Impairment of equipment held for sale	56,000	123,000	$ 375,000
Previously Capitalized Software
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of capitalized software development costs		635,000
Previously Capitalized Software | Held for sale | Selling and marketing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of capitalized software development costs	2,600,000
Equipment | Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of equipment held for sale	$ 56,000	$ 123,000	265,000
Equipment | Prior to placing in service
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of equipment held for sale			$ 110,000