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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2014
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value on recurring basis
The following tables present financial assets and liabilities at March 31, 2014 and December 31, 2013 for which the Company measures fair value on a recurring basis, by level, within the fair value hierarchy:
March 31, 2014
Total
 
Level 1
 
Level 2
 
Level 3
 
Valuation
Technique
Assets
 
 
 
 
 
 
 
 
 
Money market mutual funds
$
16,821

 
$
16,821

 
$
—

 
$
—

 
(a)
Government agency bonds
7,501

 
7,501

 
—

 
—

 
(a)
United States treasuries
4,008

 
4,008

 
—

 
—

 
(a)
Municipal bonds
4,186

 
4,186

 
—

 
—

 
(a)
Corporate notes
6,386

 
6,386

 
—

 
—

 
(a)
Certificates of deposit
2,523

 
2,523

 
—

 
—

 
(a)
Foreign currency forward contracts
94

 
—

 
94

 
—

 
(c)
Liabilities
 
 
 
 
 
 
 
 
 
Interest rate swaps
$
322

 
$
—

 
$
322

 
$
—

 
(b)
 
December 31, 2013
Total
 
Level 1
 
Level 2
 
Level 3
 
Valuation
Technique
Assets
 
 
 
 
 
 
 
 
 
Money market mutual funds
$
19,957

 
$
19,957

 
$
—

 
$
—

 
(a)

Government agency bonds
7,509

 
7,509

 
—

 
—

 
(a)

United States treasuries
8,041

 
8,041

 
—

 
—

 
(a)

Corporate notes
8,453

 
8,453

 
—

 
—

 
(a)

Certificates of deposit
2,426

 
2,426

 
—

 
—

 
(a)

Foreign currency forward contracts
114

 
—

 
114

 
—

 
—

Liabilities
 
 
 
 
 
 
 
 
 
Interest rate swaps
$
332

 
$
—

 
$
332

 
$
—

 
(b)