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Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies [Line Items]
Long-Term Contracts, Contract Price	$ 60,573	$ 5,153
Long-Term Contracts, Commitments Amount	40,814	3,760
Security Deposit	1,230	1,091
Operating Leases, Rent Expense, Net	2,189	2,148	$ 2,082
Contractual Obligation	$ 193,446	$ 89,179
Lease Expiration Period	The lease arrangement will expire gradually from 2018 to 2024
Minimum [Member]
Commitments and Contingencies [Line Items]
Sales Commissions Percentage	0.50%
Maximum [Member]
Commitments and Contingencies [Line Items]
Sales Commissions Percentage	2.00%

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Period which lease or group of leases is set to expire.

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Amount of remaining commitments under long-term contracts or programs.

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- Definition

Amount of contract price under long-term contracts or programs.

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- Definition

The percentage of commissions to paid upon the sales by commissioned employees or third parties of the entity's goods or services.

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

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The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8,17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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