Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):

	December 31, 2017
	Level 1		Level 2		Level 3		Total
Assets:
Cash Equivalents
Money market funds	$	10,946	$	—	$	—	$	10,946
Commercial paper	—		1,996		—		1,996
Total cash equivalents	10,946		1,996		—		12,942
Available-for-Sale Securities
Certificates of deposit(1)	—		19,875		—		19,875
Corporate bonds	—		29,239		—		29,239
U.S. government bonds	—		8,189		—		8,189
Total available-for-sale securities	—		57,303		—		57,303
Derivatives
Interest rate swap contract	—		372		—		372
Foreign currency forward contracts	—		390		—		390
Total derivatives	—		762		—		762
Total assets measured at fair value	$	10,946	$	60,061	$	—	$	71,007

	December 31, 2016
	Level 1		Level 2			Level 3		Total
Assets:
Cash Equivalents
Money market funds	$	9,635	$	—		$	—	$	9,635
Commercial paper	—		3,999			—		3,999
Total cash equivalents	9,635		3,999			—		13,634
Available-for-Sale Securities
Certificates of deposit(1)	—		22,820			—		22,820
Corporate bonds	—		6,922			—		6,922
U.S. government bonds	—		2,001			—		2,001
Total available-for-sale securities	—		31,743			—		31,743
Total assets measured at fair value	$	9,635	$	35,742		$	—	$	45,377
Liabilities:
Derivatives
Interest rate swap contract	$	—	$	(38	)	$	—	$	(38	)
Total liabilities measured at fair value	$	—	$	(38	)	$	—	$	(38	)

⁽¹⁾ All certificates of deposit are within current FDIC insurance limits.