Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ (26,311)	$ (22,560)	$ (16,196)
Changes due to amendments to tax laws and exchange rate differences	1,393	1,806	917,000
Adjustment previous year loss		(591)
Additions during the year	(4,737)	(4,966)	(7,281)
Balance at end of year	$ (29,655)	$ (26,311)	$ (22,560)

Valuation Allowance, Deferred Tax Asset, Adjustments, Amount

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- Definition

Valuation Allowance, Deferred Tax Asset, Changes Due to Amendments in Tax Laws and Exchange Rate Differences, Amount

+ References

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e32123-109318

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