CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Accumulated Items of Other Comprehensive Loss	Non-Controlling Interest	2017 Securities Purchase Agreement	2017 Securities Purchase Agreement Common Stock	2017 Securities Purchase Agreement Additional Paid-In Capital	2018 Public Offering	2018 Public Offering Common Stock	2018 Public Offering Additional Paid-In Capital
Balance (in shares) at Dec. 31, 2016		14,450,000
Balance at Dec. 31, 2016	$ (3,724)	$ 14	$ 1,283,376	$ (6,923)	$ (1,278,699)	$ (1,492)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(8,046)
Balance at Mar. 31, 2017	29,991
Balance (in shares) at Dec. 31, 2016		14,450,000
Balance at Dec. 31, 2016	(3,724)	$ 14	1,283,376	(6,923)	(1,278,699)	(1,492)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(26,940)
Balance at Jun. 30, 2017	11,585
Balance (in shares) at Dec. 31, 2016		14,450,000
Balance at Dec. 31, 2016	(3,724)	$ 14	1,283,376	(6,923)	(1,278,699)	(1,492)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(37,556)
Balance at Sep. 30, 2017	5,936
Balance (in shares) at Dec. 31, 2016		14,450,000
Balance at Dec. 31, 2016	(3,724)	$ 14	1,283,376	(6,923)	(1,278,699)	(1,492)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(44,166)				(44,166)
Net income attributable to non-controlling interest	(70)				(70)		70
Correction of errors	505				505
Foreign currency translation	23					23
Foreign currency contracts	145					145
Movement in non-controlling interest	3,999						3,999
Common stock issuance (in shares)		379,000							5,951,000
Common stock issuance, net	0							$ 40,163	$ 7	$ 40,156
Employee taxes paid on withholding shares (in shares)		(25,000)
Employee taxes paid on withholding shares	(236)			(236)
Stock-based compensation	3,121		3,121
Proceeds from exercise of stock options, net (in shares)		49,000
Proceeds from exercise of stock options, net	431		431
Balance (in shares) at Dec. 31, 2017		20,804,000
Balance at Dec. 31, 2017	580	$ 21	1,327,084	(7,159)	(1,322,111)	(1,324)	4,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(13,651)
Balance at Mar. 31, 2018	11,811
Balance (in shares) at Dec. 31, 2017		20,804,000
Balance at Dec. 31, 2017	580	$ 21	1,327,084	(7,159)	(1,322,111)	(1,324)	4,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(27,430)
Balance at Jun. 30, 2018	(3,008)
Balance (in shares) at Dec. 31, 2017		20,804,000
Balance at Dec. 31, 2017	580	$ 21	1,327,084	(7,159)	(1,322,111)	(1,324)	4,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(42,245)
Balance at Sep. 30, 2018	(16,585)
Balance (in shares) at Dec. 31, 2017		20,804,000
Balance at Dec. 31, 2017	580	$ 21	1,327,084	(7,159)	(1,322,111)	(1,324)	4,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(61,075)				(61,075)
Net income attributable to non-controlling interest	(125)				(125)		125
Foreign currency translation	259					259
Foreign currency contracts	0
Movement in non-controlling interest	(1,400)						(1,400)
Common stock issuance (in shares)		471,000
Common stock issuance, net	0
Employee taxes paid on withholding shares (in shares)		(36,000)
Employee taxes paid on withholding shares	(487)			(487)
2018 public offering, net (in shares)												4,210,000
2018 public offering, net											$ 37,103	$ 4	$ 37,099
Stock-based compensation	4,737		4,737
Proceeds from exercise of stock options, net (in shares)		6,000
Proceeds from exercise of stock options, net	$ 48		48
Balance (in shares) at Dec. 31, 2018	25,455,000	25,455,000
Balance at Dec. 31, 2018	$ 2,969	$ 25	1,368,968	(7,646)	(1,360,107)	(1,065)	2,794
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(19,985)
Balance at Mar. 31, 2019	$ (17,423)
Balance (in shares) at Dec. 31, 2018	25,455,000	25,455,000
Balance at Dec. 31, 2018	$ 2,969	$ 25	1,368,968	(7,646)	(1,360,107)	(1,065)	2,794
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(37,947)
Balance at Jun. 30, 2019	$ (34,411)
Balance (in shares) at Dec. 31, 2018	25,455,000	25,455,000
Balance at Dec. 31, 2018	$ 2,969	$ 25	1,368,968	(7,646)	(1,360,107)	(1,065)	2,794
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(62,009)
Balance at Sep. 30, 2019	$ (57,303)
Balance (in shares) at Dec. 31, 2018	25,455,000	25,455,000
Balance at Dec. 31, 2018	$ 2,969	$ 25	1,368,968	(7,646)	(1,360,107)	(1,065)	2,794
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(138,169)				(138,169)
Net income attributable to non-controlling interest	(81)				(81)		81
Foreign currency translation	354					354
Foreign currency contracts	0
Movement in non-controlling interest	(1,851)		1,024				(2,875)
Common stock issuance (in shares)		1,159,000
Common stock issuance, net	(16)	$ 1	(17)
Employee taxes paid on withholding shares (in shares)		(59,000)
Employee taxes paid on withholding shares	(312)			(312)
Stock-based compensation	$ 4,255		4,255
Balance (in shares) at Dec. 31, 2019	26,555,000	26,555,000
Balance at Dec. 31, 2019	$ (132,822)	$ 26	$ 1,374,230	$ (7,958)	$ (1,498,409)	$ (711)	$ 0