Condensed Consolidated Statements of Shareholders' and Total Equity - USD ($) $ in Thousands	Total	Total Shareholders' Equity	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Noncontrolling Interests
Balances (in shares) at Dec. 31, 2018			160,020,466
Balances at Dec. 31, 2018	$ 378,722	$ 362,855	$ 0	$ 1,722,012	$ (28,612)	$ (1,330,545)	$ 15,867
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	14,538	14,469		14,469			69
Shares issued upon vesting of restricted stock units and for exercises of stock options and warrants (in shares)			796,859
Shares issued upon vesting of restricted stock units and for exercises of stock options	$ 313	63		63			250
Shares issued for accrued compensation (in shares)	150,908
Shares issued for accrued compensation	$ 1,102	1,102		1,102
Shares issued as payment for services (in shares)			1,543,707
Shares issued as payment for services	7,987	7,987		7,987
Shares and warrants issued in public and private offerings, net of issuance costs	6,611						6,611
Deconsolidation of subsidiary	(21,672)						(21,672)
Adjustments for noncontrolling interests	0	(456)		(456)			456
Net loss	(154,701)	(153,109)				(153,109)	(1,592)
Release of cumulative foreign currency translation adjustments to loss from discontinued operations	0
Other comprehensive income (loss)	(4,479)	(4,490)			(4,490)		11
Balances (in shares) at Sep. 30, 2019			162,511,940
Balances at Sep. 30, 2019	228,421	228,421	$ 0	1,745,177	(33,102)	(1,483,654)	0
Balances (in shares) at Jun. 30, 2019			161,917,424
Balances at Jun. 30, 2019		279,223	$ 0	1,737,449	(28,206)	(1,430,020)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense		5,423		5,423
Shares issued upon vesting of restricted stock units and for exercises of stock options and warrants (in shares)			164,844
Shares issued upon vesting of restricted stock units and for exercises of stock options		6		6
Shares issued as payment for services (in shares)			429,672
Shares issued as payment for services		2,299		2,299
Net loss	(53,634)	(53,634)				(53,634)
Release of cumulative foreign currency translation adjustments to loss from discontinued operations	0
Other comprehensive income (loss)		(4,896)			(4,896)
Balances (in shares) at Sep. 30, 2019			162,511,940
Balances at Sep. 30, 2019	$ 228,421	228,421	$ 0	1,745,177	(33,102)	(1,483,654)	$ 0
Balances (in shares) at Dec. 31, 2019	163,274,880		163,274,880
Balances at Dec. 31, 2019		71,711	$ 0	1,752,048	(27,468)	(1,652,869)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense		13,869		13,869
Shares issued upon vesting of restricted stock units and for exercises of stock options and warrants (in shares)			868,857
Shares issued upon vesting of restricted stock units and for exercises of stock options		69		69
Shares issued for accrued compensation (in shares)			1,880,405
Shares issued for accrued compensation		5,100		5,100
Shares issued as payment for services (in shares)			413,911
Shares issued as payment for services		1,006		1,006
Shares issued in private placement (in shares)			5,972,696
Shares and warrants issued in public and private offerings, net of issuance costs		35,000		35,000
Shares issued upon conversion of long-term debt (in shares)			6,293,402
Shares issued upon conversion of long-term debt		31,827		31,827
Net loss	$ (128,860)	(128,860)				(128,860)
Release of cumulative foreign currency translation adjustments to loss from discontinued operations	$ 26,957	26,957			26,957
Other comprehensive income (loss)		1,873			1,873
Balances (in shares) at Sep. 30, 2020	178,704,151		178,704,151
Balances at Sep. 30, 2020		58,552	$ 0	1,838,919	1,362	(1,781,729)
Balances (in shares) at Jun. 30, 2020			172,285,932
Balances at Jun. 30, 2020		49,542	$ 0	1,802,413	(650)	(1,752,221)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense		4,600		4,600
Shares issued upon vesting of restricted stock units and for exercises of stock options and warrants (in shares)			28,389
Shares issued upon vesting of restricted stock units and for exercises of stock options		3		3
Shares issued for accrued compensation (in shares)			75,000
Shares issued for accrued compensation		0		0
Shares issued as payment for services (in shares)			21,428
Shares issued as payment for services		76		76
Shares issued upon conversion of long-term debt (in shares)			6,293,402
Shares issued upon conversion of long-term debt		31,827		31,827
Net loss	$ (29,508)	(29,508)				(29,508)
Release of cumulative foreign currency translation adjustments to loss from discontinued operations	$ 0
Other comprehensive income (loss)		2,012			2,012
Balances (in shares) at Sep. 30, 2020	178,704,151		178,704,151
Balances at Sep. 30, 2020		$ 58,552	$ 0	$ 1,838,919	$ 1,362	$ (1,781,729)