Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenue, net		$ 5,020	$ 10,053
Cost and expense
Cost of revenue (excluding depreciation and amortization)		3,514	12,903
Sales and marketing	[1]	3,003	4,308
Technology and development	[1]	3,573	4,393
General and administrative	[1]	14,174	28,521
Depreciation and amortization		982	2,089
Impairments		2,522	2,209
Other operating expense		6	130
Total cost and expense		27,774	54,553
Operating loss from continuing operations		(22,754)	(44,500)
Other income (expense)
Interest expense		(1,876)	(3,237)
Other income, net		530	267
Change in fair value of warrant liability		1,268	27,879
Other gain (loss)		(172)	886
Total other income (expense), net		(250)	25,795
Loss from continuing operations before income tax		(23,004)	(18,705)
Benefit from income taxes		0	140
Loss from continuing operations		(23,004)	(18,565)
Loss from discontinued operations, net of tax (Note 18)		(2,610)	(2,993)
Net loss		(25,614)	(21,558)
Other comprehensive income (loss)
Foreign currency translation adjustments		(259)	(83)
Comprehensive loss		$ (25,873)	$ (21,641)
Weighted-average shares outstanding, basic and diluted (in shares)		44,432	39,053
Net loss per share, basic and diluted
Continuing operations (in dollars per share)		$ (0.52)	$ (0.48)
Discontinued operations (in dollars per share)		(0.06)	(0.07)
Consolidated (in dollars per share)		$ (0.58)	$ (0.55)

[1] Includes share-based compensation as follows: Sales and marketing of $24 and 129 ; Technology and development of $70 and $(280); General and administrative of $225 and $13,098; and Other operating expense of $0 and 1 as of December 31, 2019 and December 31, 2018, respectively.