Disposition of Buyer Platform - Statements of Cash Flows Disclosures (Details) - Buyer Platform - Discontinued operations, disposed of by sale - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Non-cash adjustments to net cash from operating activities:
Depreciation and amortization	$ 3,174	$ 5,419	$ 6,168
Stock based compensation expense	673	1,414	1,551
Cash used in investing activities:
Capital expenditures	$ 475	$ 0	$ 0

Amount of stock-based compensation expense discontinued operations attributable to discontinued operations.

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- References

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- Definition

Amount of capital expenditure attributable to discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

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Amount of deprecation and amortization expense attributable to property, plant and equipment and intangible assets of discontinued operations.

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