Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net loss	$ (4,006)	$ (3,361)	$ (1,213)	$ (15,875)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Income from discontinued operations, net of taxes	0	(417)	0	(1,397)
Loss on disposal of discontinued operations, net of taxes	0	1,172	0	7,800
Equity in net (income) loss of investee	126	339	(42)	623
Dividend received from investee			0	780
Equity in net income of limited liability investments			(34)	(203)
Depreciation and amortization expense			5,146	5,099
Stock-based compensation expense (benefit), net of forfeitures			531	(1,880)
Net realized (gains) losses	(1,001)	414	(760)	17
Loss (gain) on change in fair value of equity investments	38	(337)	23	(1,081)
(Gain) loss on change in fair value of limited liability investments, at fair value	(3,356)	(131)	3,256	(1,592)
Net change in unrealized loss on private company investments			324	136
(Gain) loss on change in fair value of debt			(2,104)	2,511
Deferred income taxes, adjusted for Geminus liabilities assumed			(781)	(265)
Other-than-temporary impairment loss			75	0
Amortization of fixed maturities premiums and discounts			(20)	47
Amortization of note payable premium			(689)	(707)
Gain on disposal of subsidiary			0	(17)
Service fee receivable, net, adjusted for Geminus assets acquired			(2,460)	(2,356)
Other receivables, net, adjusted for Geminus assets acquired			(1,319)	(1,739)
Deferred acquisition costs, net			(1,343)	(574)
Unpaid loss and loss adjustment expenses			(216)	963
Deferred service fees, adjusted for Geminus liabilities assumed			5,618	4,872
Other, net, adjusted for Geminus assets acquired and liabilities assumed			2,529	(6,264)
Cash provided by (used in) operating activities - continuing operations			9	(7,918)
Cash used in operating activities - discontinued operations			0	(7,378)
Net cash provided by (used in) operating activities			9	(15,296)
Investing activities:
Proceeds from sales and maturities of fixed maturities			9,401	5,241
Proceeds from sales of equity investments			683	4,966
Purchases of fixed maturities			(9,794)	(1,885)
Purchases of equity investments			0	(857)
Net proceeds from limited liability investments			355	4,113
Net proceeds from limited liability investments			507	(945)
Net proceeds from investments in private companies			824	119
Net proceeds from other investments			1,384	404
Net proceeds from short-term investments			50	0
Proceeds from sale of investee			0	1,001
Proceeds from disposal of subsidiary			0	565
Net proceeds from sale of discontinued operations			0	1,129
Acquisition of business, net of cash acquired			(4,847)	0
Net disposals of property and equipment, adjusted for Geminus assets acquired			(164)	550
Cash (used in) provided by investing activities - continuing operations			(1,601)	14,401
Cash provided by investing activities - discontinued operations			0	1,977
Net cash (used in) provided by investing activities			(1,601)	16,378
Financing activities:
Taxes paid related to net share settlements of restricted stock awards			(89)	(376)
Principal proceeds from bank loan, net of debt issuance costs of $981			9,019	0
Principal payments on bank loans			(2,290)	(750)
Principal payments on notes payable			(2,786)	(2,507)
Cash provided by (used in) financing activities - continuing operations			3,854	(3,633)
Cash used in financing activities - discontinued operations			0	0
Net cash provided by (used in) financing activities			3,854	(3,633)
Net increase in cash and cash equivalents and restricted cash from continuing operations			2,262	2,850
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	$ 33,840	$ 23,212	$ 33,840	$ 23,212	$ 31,578