STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY/PARTNERS' CAPITAL - USD ($) $ in Thousands	Ordinary shares	Additional Paid-in Capital [Member]	Accumulated deficit	Partners' capital [Member]	Accumulated other comprehensive loss	Total
Increase (Decrease) in Partners' Capital [Roll Forward]
Cumulative effect of change in accounting standard				$ 1,047		$ 1,047
Partners' Capital, Beginning Balance at Dec. 31, 2017				434,280	$ (633)	433,647
Increase (Decrease) in Partners' Capital [Roll Forward]
Partners’ distributions				(2)		(2)
Partners' Capital, Ending Balance at Oct. 17, 2018				429,012	(1,802)	427,210
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)				(7,561)		(7,561)
Change in foreign currency translation adjustments					(1,169)	(1,169)
Share compensation				1,248		1,248
Partners' Capital, Beginning Balance at Dec. 31, 2017				434,280	(633)	433,647
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						(109,681)
Change in foreign currency translation adjustments						(1,213)
Stockholders' equity, ending balance at Dec. 31, 2018	$ 525	$ 487,288	$ (102,120)		(1,846)	383,847
Partners' Capital, Beginning Balance at Oct. 17, 2018				429,012	(1,802)	427,210
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)			(102,120)			(102,120)
Change in foreign currency translation adjustments					(44)	(44)
Share compensation		717				717
Effect of reorganization, value	$ 429	428,583		$ (429,012)
Effect of reorganization, shares	42,857,139
Issuance of ordinary shares in initial public offering and private placement, net of offering costs	$ 96	57,988				58,084
Issuance of ordinary shares in initial public offering and private placement, shares	9,661,785
Stockholders' equity, ending balance at Dec. 31, 2018	$ 525	487,288	(102,120)		(1,846)	383,847
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, Outstanding	52,518,924
Net income (loss)			(270,901)			(270,901)
Change in foreign currency translation adjustments					(383)	(383)
Share compensation		4,932				4,932
Repurchase of ordinary shares, value	$ (7)	(2,780)				$ (2,787)
Repurchase of ordinary shares, shares	(673,182)					(673,182)
Stockholders' equity, ending balance at Dec. 31, 2019	$ 518	$ 489,440	$ (373,021)		$ (2,229)	$ 114,708
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, Outstanding	51,845,742