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Revenue Recognition (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Jan. 02, 2018	Dec. 31, 2017
Contract with Customer, Liability, Revenue Recognized	$ 35,300	$ 37,300
Revenue, Remaining Performance Obligation	1,018,621	1,018,621
Retained Earnings (Accumulated Deficit)	$ 164,085	164,085		$ 143,241
Accounting Standards Update 2014-09 [Member]
Increase in Revenue		$ 300
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member]
Retained Earnings (Accumulated Deficit)			$ 700

X

- Definition

The increase amount of revenue during the year.

+ References

No definition available.

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Name Accounting Standards Codification
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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
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