A device of credit enhancement where a part of the purchase price for the receivable/ payable is retained to serve as a cash collateral.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

Name:	us-gaap_SupplementalDeferredPurchasePrice
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Discontinued operations - Additional Information (Details) - USD ($)		1 Months Ended		3 Months Ended		12 Months Ended
	Jan. 07, 2019	Aug. 31, 2019	Feb. 14, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Discontinued operations - CW-Belize
Proceeds From Repatriated Funds	$ 1,100,000			$ 1,000,000	$ 2,750,000	$ 458,000	$ 400,000
Disposal Group, Including Discontinued Operation, Consideration			$ 7,000,000
Proceeds from Divestiture of Businesses		$ 265,000	6,735,000
Supplemental Deferred Purchase Price			$ 265,000