Short-term Investments - (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Sep. 30, 2018
Schedule Of Available For Sale Securities [Line Items]
Short-term investments	$ 23,608	$ 2,499
Short Term Deposit Weighted Average Interest Rate	1.60%
Bank Deposits
Schedule Of Available For Sale Securities [Line Items]
Short-term investments	$ 15,000

Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(4))
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-Name Accounting Standards Codification
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Name:	us-gaap_ShortTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant