Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

			Fair Value Measurements at December 31, 2019
			Quoted Prices in Active Markets for		Significant Other		Significant
			Identical		Observable		Unobservable
			Assets		Inputs		Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Assets:
Short-term investments	$	60,714	$	—	$	60,714	$	—
Foreign currency forward exchange contracts accounted for using hedge accounting		16				16
Foreign currency forward exchange contracts not accounted for using hedge accounting		112		—		112		—
	$	60,842	$	—	$	60,842	$	—
Liabilities:
Interest rate swap	$	30	$	—	$	30	$	—

			Fair Value Measurements at December 31, 2018
			Quoted Prices in Active Markets for		Significant Other		Significant
			Identical		Observable		Unobservable
			Assets		Inputs		Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Assets:
Short-term investments	$	67,870	$	—	$	67,870	$	—
Foreign currency forward exchange contracts accounted for using hedge accounting		179				179
	$	68,049	$	—	$	68,049	$	—
Liabilities:
Foreign currency forward exchange contracts not accounted for using hedge accounting		45		—		45		—
Interest rate swap	$	207	$	—	$	207	$	—
	$	252	$	—	$	252	$	—