Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of fair value, assets measured on recurring basis

The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value.

			Fair Value Measurements at September 30, 2018
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Short-term investments	$	77,173	$	—	$	77,173	$	—
Liabilities:
Foreign currency forward exchange contracts accounted for using hedge accounting	$	34	$	—	$	34	$	—
Foreign currency forward exchange contracts not accounted for using hedge accounting		79				79
Interest rate swap		243		—		243		—
	$	356	$	—	$	356	$	—

			Fair Value Measurements at December 31, 2017
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Short-term investments	$	69,899	$	—	$	69,899	$	—
Foreign currency forward exchange contracts accounted for using hedge accounting		26				26
Foreign currency forward exchange contracts not accounted for using hedge accounting		119		—		119		—
	$	70,044	$	—	$	70,044	$	—
Liabilities:
Interest rate swap	$	529	$	—	$	529	$	—