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Basis of Presentation - Restricted Cash (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash		$ 0
Net cash used in operating activities	$ (3,869)	(14,791)
Net increase in cash, cash equivalents and restricted cash	10,349	10,104
Cash, cash equivalents and restricted cash, end of period	$ 31,608	19,998	$ 21,259	$ 9,894
Scenario, Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash		(411)
Net cash used in operating activities		(15,202)
Net increase in cash, cash equivalents and restricted cash		9,693
Cash, cash equivalents and restricted cash, end of period		19,587
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash		411
Net cash used in operating activities		411
Net increase in cash, cash equivalents and restricted cash		411
Cash, cash equivalents and restricted cash, end of period		$ 411

X

- Definition

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585

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+ References

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