Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Noncontrolling Interests	Series E Preferred Stock	Series E Preferred Stock Preferred Stock	Series E Preferred Stock Additional Paid-in Capital
Beginning balance at Dec. 31, 2018	$ (36,525)	$ 0	$ 74	$ 546,230	$ (4,877)	$ (577,817)	$ (135)
Beginning Balance (shares) at Dec. 31, 2018		0	73,980,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(7,471)					(7,485)	14
Foreign currency translation adjustment	(583)				(583)
Exercise of stock options and vesting of restricted stock units	399		$ 1	398
Exercise of stock options and vesting of restricted stock units (shares)			497,000
Taxes withheld on net settled vesting of restricted stock units	(112)			(112)
Exercise of warrants	10,639		$ 4	10,635
Exercise of warrants (shares)			4,222,000
Share-based compensation	1,057			1,057
Ending balance at Mar. 31, 2019	(32,596)	$ 0	$ 79	558,208	(5,460)	(585,302)	(121)
Ending Balance (shares) at Mar. 31, 2019		0	78,699,000
Beginning balance at Dec. 31, 2019	(37,358)	$ 0	$ 82	584,862	(3,879)	(618,303)	(120)
Beginning Balance (shares) at Dec. 31, 2019		10,000	81,974,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(18,166)					(18,198)	32
Foreign currency translation adjustment	(13,480)				(13,480)
Exercise of stock options and vesting of restricted stock units	49		$ 0	49
Exercise of stock options and vesting of restricted stock units (shares)			129,000
Taxes withheld on net settled vesting of restricted stock units	(73)			(73)
Issuance of shares								$ 27,330		$ 27,330
Issuance of shares (shares)									27,000
Issuance of common shares in connection with the Notes Exchange	66,087		$ 14	66,073
Issuance of common shares in connection with the Notes Exchange (shares)			13,739,000
Exercise of warrants	$ 1,861		$ 0	1,861
Exercise of warrants (shares)	338,454		338,000
Share-based compensation	$ 1,553			1,553
Series E preferred stock dividends	0			392		(392)
Ending balance at Mar. 31, 2020	$ 27,803	$ 0	$ 96	$ 682,047	$ (17,359)	$ (636,893)	$ (88)
Ending Balance (shares) at Mar. 31, 2020		37,000	96,180,000