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SEGMENT REPORTING - Schedule of Sales Data by Geographical Area (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEGMENT REPORTING
Net Sales by Segment	[1]	$ 65,623	$ 115,944	$ 98,292
Net Sales by Segment (as a percent)		100.00%	100.00%	100.00%
China
SEGMENT REPORTING
Net Sales by Segment		$ 2,439	$ 3,146	$ 2,926
Net Sales by Segment (as a percent)		4.00%	3.00%	3.00%
India
SEGMENT REPORTING
Net Sales by Segment		$ 37,206	$ 70,106	$ 42,352
Net Sales by Segment (as a percent)		57.00%	60.00%	43.00%
Japan
SEGMENT REPORTING
Net Sales by Segment		$ 21,761	$ 35,504	$ 49,185
Net Sales by Segment (as a percent)		33.00%	31.00%	50.00%
Taiwan
SEGMENT REPORTING
Net Sales by Segment		$ 3,515	$ 6,445	$ 3,018
Net Sales by Segment (as a percent)		5.00%	6.00%	3.00%
Other
SEGMENT REPORTING
Net Sales by Segment		$ 702	$ 743	$ 811
Net Sales by Segment (as a percent)		1.00%	1.00%	1.00%
[1] The revenue recognized in the years ended December 31, 2019, 2018 and 2017 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each respective period were $2.8 million, $4.0 million and $2.7 million, respectively.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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