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Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Accounting Policies [Abstract]
Net loss on foreign currency translations	$ (4,952)	$ (270)	$ (512)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings	5,014	(107,620)		$ (82,784)	$ (77,836)	$ (66,397)
Cumulative effect of adjustment to retained earnings (ASU Adoption)		(3,196)	234
Capitalized Contract Cost, Net	700
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adjustment to retained earnings (ASU Adoption)		$ (3,196)	$ (476)
Accounting Standards Update 2016-16 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adjustment to retained earnings (ASU Adoption)	300
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings	$ (10,100)

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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