Income Taxes - Schedule of Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal:
Current	$ 0	$ 0	$ 0
Deferred	(310)	(10,941)	0
State:
Current	2	49	(160)
Deferred	0	(1,384)	0
Foreign:
Current	5,917	3,156	5,604
Deferred	(977)	399	(1,354)
Total	$ 4,632	$ (8,721)	$ 4,090

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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