ACCOUNTS RECEIVABLE, NET (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
ACCOUNTS RECEIVABLE, NET
Accounts receivable	$ 2,896	$ 910
Less: allowance for doubtful accounts	(92)	(34)	$ (36)
Accounts receivable, net	$ 2,804	$ 876

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant