Disposition of Buyer Platform - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Non-cash adjustments to net cash from operating activities:
Stock based compensation expense	$ 5,759	$ 3,820	$ 5,394
Discontinued operations disposed of by sale \| Buyer Platform
Non-cash adjustments to net cash from operating activities:
Depreciation and amortization		0	3,174
Stock based compensation expense		0	673
Cash used in investing activities:
Capital expenditures		$ 0	$ 475

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