Disposition of Buyer Platform - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Non-cash adjustments to net cash from operating activities:
Stock-based compensation expense			$ 1,836	$ 2,065
Discontinued operations disposed of by sale \| Buyer Platform
Non-cash adjustments to net cash from operating activities:
Depreciation and amortization	$ 0	$ 1,367	0	2,695
Stock-based compensation expense			0	569
Cash used in investing activities:
Capital expenditures			$ 0	$ 462

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Amount of capital expenditure attributable to discontinued operations.

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