Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Net loss	$ (28,336)	$ (11,609)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract]
Unrealized gains (losses) arising during the period	12	(5,213)
Reclassification adjustment for amounts included in net loss	(18)	1,076
Change in fair value of debt attributable to instrument-specific credit risk	3,804	0
Equity in other comprehensive loss of limited liability investment	(45)	0
Recognition of currency translation loss on liquidation of subsidiary	0	(494)
Other comprehensive income (loss)	4,124	(3,643)
Comprehensive loss	(24,212)	(15,252)
Less: comprehensive income attributable to noncontrolling interests in consolidated subsidiaries	1,764	4,085
Comprehensive loss attributable to common shareholders	(25,976)	(19,337)
Discontinued Operations [Member]
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract]
Unrealized gains (losses) arising during the period	$ 371	$ 0

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