Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net income (loss)	$ (396)	$ (10,296)	$ 2,793	$ (12,514)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Income from discontinued operations, net of taxes	0	(594)	0	(980)
Loss on disposal of discontinued operations, net of taxes	0	6,628	0	6,628
Equity in net (income) loss of investee	(201)	385	(168)	284
Equity in net income of limited liability investments			(14)	(181)
Depreciation and amortization expense			3,373	2,678
Stock-based compensation expense, net of forfeitures			386	588
Net realized losses (gains)	556	(132)	241	(397)
Gain on change in fair value of equity investments	63	421	(15)	(744)
(Gain) loss on change in fair value of limited liability investments, at fair value	2,347	(525)	6,612	(1,461)
Net change in unrealized (gain) loss on private company investments			(19)	155
(Gain) loss on change in fair value of debt			(1,494)	1,061
Deferred income taxes, adjusted for Geminus liabilities assumed			(816)	56
Other-than-temporary impairment loss			75	0
Amortization of fixed maturities premiums and discounts			(7)	32
Amortization of note payable premium			(461)	(473)
Gain on disposal of subsidiary			0	(17)
Changes in operating assets and liabilities:
Service fee receivable, net, adjusted for Geminus assets acquired			(1,299)	(787)
Other receivables, net, adjusted for Geminus assets acquired			(1,019)	(1,617)
Deferred acquisition costs, net			(820)	(337)
Unpaid loss and loss adjustment expenses			(136)	1,265
Deferred service fees, adjusted for Geminus liabilities assumed			3,828	3,255
Other, net, adjusted for Geminus assets acquired and liabilities assumed			(270)	(3,566)
Cash used in operating activities - continuing operations			(2,454)	(4,150)
Cash used in operating activities - discontinued operations			0	(1,909)
Cash used in operating activities - discontinued operations			(2,454)	(6,059)
Investing activities:
Proceeds from sales and maturities of fixed maturities			5,887	4,965
Proceeds from sales of equity investments			675	3,704
Purchases of fixed maturities			(9,794)	(1,885)
Purchases of equity investments			0	(806)
Net proceeds from limited liability investments			282	2,199
Net purchases of limited liability investments, at fair value			(336)	(666)
Net proceeds from investments in private companies			249	95
Net proceeds from other investments			1,239	405
Net proceeds from short-term investments			30	0
Proceeds from disposal of subsidiary			0	565
Net proceeds from sale of discontinued operations			0	1,129
Acquisition of business, net of cash acquired			(4,792)	0
Net disposals of property and equipment, adjusted for Geminus assets acquired			(134)	593
Cash (used in) provided by investing activities - continuing operations			(6,694)	10,298
Cash used in investing activities - discontinued operations			0	(3,086)
Net cash (used in) provided by investing activities			(6,694)	7,212
Financing activities:
Taxes paid related to net share settlements of restricted stock awards			(89)	0
Principal proceeds from bank loan, net of debt issuance costs of $981			9,019	0
Principal payments on bank loans			(1,325)	(500)
Principal payments on notes payable			(1,816)	(1,632)
Cash provided by (used in) financing activities - continuing operations			5,789	(2,132)
Cash used in financing activities - discontinued operations			0	0
Net cash provided by (used in) financing activities			5,789	(2,132)
Net (decrease) increase in cash and cash equivalents and restricted cash from continuing operations			(3,359)	4,016
Cash and cash equivalents and restricted cash at beginning of period					$ 31,578	$ 43,874
Less: cash and cash equivalents and restricted cash of discontinued operations at beginning of period					0	$ 23,512
Cash and cash equivalents and restricted cash of continuing operations at beginning of period			31,578	20,362	20,362
Cash and cash equivalents and restricted cash of continuing operations at end of period	$ 28,219	$ 24,378	$ 28,219	$ 24,378	$ 31,578