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Fair Value Measurement (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets:
Short-term investments	$ 66,941	$ 67,870
Foreign currency forward exchange contracts accounted for using hedge accounting	468	179
Foreign currency forward exchange contracts not accounted for using hedge accounting	279
Total Assets	67,688	68,049
Liabilities:
Interest rate swap	114	207
Foreign currency forward exchange contracts not accounted for using hedge accounting		45
Total Liabilities		252
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Short-term investments	0	0
Foreign currency forward exchange contracts accounted for using hedge accounting	0	0
Foreign currency forward exchange contracts not accounted for using hedge accounting	0
Total Assets	0	0
Liabilities:
Interest rate swap	0	0
Foreign currency forward exchange contracts not accounted for using hedge accounting		0
Total Liabilities		0
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Short-term investments	66,941	67,870
Foreign currency forward exchange contracts accounted for using hedge accounting	468	179
Foreign currency forward exchange contracts not accounted for using hedge accounting	279
Total Assets	67,688	68,049
Liabilities:
Interest rate swap	114	207
Foreign currency forward exchange contracts not accounted for using hedge accounting		45
Total Liabilities		252
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Short-term investments	0	0
Foreign currency forward exchange contracts accounted for using hedge accounting	0	0
Foreign currency forward exchange contracts not accounted for using hedge accounting	0
Total Assets	0	0
Liabilities:
Interest rate swap	$ 0	0
Foreign currency forward exchange contracts not accounted for using hedge accounting		0
Total Liabilities		$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value as of the balance sheet date of all foreign currency derivative assets not designated as hedging instruments.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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