Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2018

Discontinued Operations And Disposal Groups [Abstract]

Summary of Discontinued Operations

Results of the discontinued operations are summarized as follows:

	For the year ended December 31,
	2018		2017		2016
Sales	$	—	$	—	$	—
Cost of sales		—		—		—
Gross profit		—		—		—
Selling, general and administrative expenses		—		—		129
Research and development expenses		—		—		—
Total operating expenses		—		—		129
Operating loss		—		—		(129	)
Other income		—		—		6
Loss from discontinued operations before gain on disposition and    provision for income taxes		—		—		(123	)
Gain on disposal of Tangshan Yian		—		—		2,461
Provision for income taxes		—		—		—
Income from discontinued operations, net of income tax	$	—	$	—	$	2,338