Annual report pursuant to Section 13 and 15(d)

SEGMENT INFORMATION - Long-live Assets by Geographic Area (Details)

v3.19.1
SEGMENT INFORMATION - Long-live Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Total long-lived assets $ 934 $ 1,149
United States    
Segment Reporting Information [Line Items]    
Total long-lived assets 521 648
Hong Kong    
Segment Reporting Information [Line Items]    
Total long-lived assets 145 78
China    
Segment Reporting Information [Line Items]    
Total long-lived assets 61 112
Other foreign countries    
Segment Reporting Information [Line Items]    
Total long-lived assets $ 207 $ 311