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Investments (Tables)
 6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Short-Term and Long-Term Investments Available-for-Sale and Cost Method Investments
The fair value of investments classified as short-term consists of the following:
                 
 
June 30, 2019
   
December 31, 2018
 
Available-for-sale
investments:
    
     
 
Time deposits and certificates of deposit
  $
5,262
    $
102
 
Bankers’ acceptance drafts
   
3,833
     
989
 
Asset-backed securities
   
—
     
9,113
 
Commercial paper
   
60,154
     
19,359
 
Corporate obligations
   
8,219
     
9,352
 
U.S. treasury obligations
   
—
     
13,298
 
U.S. agency obligations
   
15,517
     
21,613
 
                 
  $
92,985
    $
73,826
 
                 
 
 
 
 
 
 
 
 
 
 
 
 
 
Investments classified as long-term consist of the following:
                 
 
June 30, 2019
   
December 31, 2018
 
Available-for-sale
investments:
    
     
 
Group insurance contracts
  $
6,001
    $
5,890
 
Cost method investments:
   
     
 
Minority interest in a private company
   
4,400
     
4,400
 
                 
  $
10,401
    $
10,290
 
                 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross Unrealized Gains and (Losses) Aggregated by Investment Category
The following tables show the gross unrealized gains and (losses) aggregated by investment category for
available-for-sale
investments:
                                 
As of June 30, 2019:
 
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
(Losses)
   
Estimated
Fair Value
 
Short-term investments:
   
     
     
     
 
Available-for-sale
investments:
    
     
     
     
 
Time deposits and certificates of deposit
  $
5,261
    $
1
    $
—
    $
5,262
 
Bankers’ acceptance drafts
   
3,833
     
—
     
—
     
3,833
 
Commercial paper
   
60,526
     
—
     
(372
 )    
60,154
 
Corporate obligations
   
8,218
     
1
     
—
     
8,219
 
U.S. agency obligations
   
15,512
     
6
     
(1
)    
15,517
 
                                 
  $
93,350
    $
8
    $
(373
 )   $
92,985
 
                                 
 
 
 
 
 
 
 
 
 
                                 
As of June 30, 2019:
 
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
(Losses)
   
Estimated
Fair Value
 
Long-term investments:
   
     
     
     
 
Available-for-sale
investments:
    
     
     
     
 
Group insurance contracts
  $
5,567
    $
434
    $
—
    $
6,001
 
                                 
 
 
 
 
 
 
 
 
 
                                 
As of December 31, 2018:
 
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
(Losses)
   
Estimated
Fair Value
 
Short-term investments:
   
     
     
     
 
Available-for-sale
investments:
    
     
     
     
 
Time deposits and certificates of deposit
  $
102
    $
—  
     $
—  
     $
102
 
Bankers’ acceptance drafts
   
989
     
—  
      
—  
      
989
 
Asset-backed securities
   
9,121
     
1
     
(9
 )    
9,113
 
Commercial paper
   
19,504
     
—  
      
(145
 )    
19,359
 
Corporate obligations
   
9,367
     
—  
      
(15
 )    
9,352
 
U.S. treasury obligations
   
13,294
     
4
     
—  
      
13,298
 
U.S. agency obligations
   
21,617
     
2
     
(6
 )    
21,613
 
                                 
  $
73,994
    $
7
    $
(175
 )   $
73,826
 
                                 
 
 
 
 
 
 
 
 
 
                                 
As of December 31, 2018:
 
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
(Losses)
   
Estimated 
Fair Value
 
Long-term investments:
   
     
     
     
 
Available-for-sale
investments:
    
     
     
     
 
Group insurance contracts
  $
5,546
    $
344
    $
 —  
     $
5,890