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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Company's Financial Assets and (Liabilities) at Fair Value on Recurring Basis
The following table summarizes the basis used to measure the Company’s financial assets at fair value on a recurring basis in the balance sheets at June 30, 2018 and December 31, 2017:
 
 
Basis of Fair Value Measurements
 
Balance at 
 June 30, 2018
 
Level 1
 
Level 2
 
Level 3
Available for sale securities
$
7,626

 
$
7,626

 
$
—

 
$
—

Foreign currency exchange contracts
—

 
—

 
—

 
—

 
 
Basis of Fair Value Measurements
 
Balance at 
 December 31, 2017
 
Level 1
 
Level 2
 
Level 3
Available for sale securities
$
6,742

 
$
6,742

 
$
—

 
$
—

Foreign currency exchange contracts
5,779

 
—

 
5,779

 
—