Segment Information (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Summary of Operation Income (Loss), Net by Geographical Areas

A summary of operation income (loss), net and long-lived assets by geographical areas is as follows:

Year ended December 31,	2017			2018			2019
Operation income from property within:
- PRC, excluding Hong Kong:	$	1,851		$	493		$	2,965
Net income (loss) within:
- PRC, excluding Hong Kong	$	(6,759	)	$	(10,590	)	$	(8,364	)
- Hong Kong		10,703			(2,664	)		(4,827	)
Total net income (loss)	$	3,944		$	(13,254	)	$	(13,191	)

Summary of Long-Lived Assets by Geographical Areas

As of December 31,		2018		2019
Long-lived assets by geographical area:
- Real estate properties under development in PRC,    excluding Hong Kong	$	171,610	$	251,685
- Property, plant and equipment in PRC, excluding    Hong Kong		27,186		25,624
- Hong Kong		256		326
- Right of use assets in PRC, excluding    Hong Kong		—		3,597
- Hong Kong		—		481
Total long-lived assets	$	199,052	$	281,713