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Investments (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Short-Term and Long-Term Investments Available-for-Sale and Cost Method Investments
Investments classified as short-term consist of the following:
  
Years Ended December 31,
 
  
     2019      
 
  
     2018      
 
Available-for-sale
investments:
    
     
 
Time deposits and certificates of deposit
  $
13,045
    $
102
 
Bankers’ acceptance drafts
   
4,043
     
989
 
Asset-backed securities
   
—
     
9,113
 
Commercial paper
   
61,205
     
19,359
 
Corporate obligations
   
—
     
9,352
 
U.S. treasury obligations
   
5,000
     
13,298
 
U.S. agency obligations
   
26,124
     
21,613
 
                 
   $
109,417
    $
73,826
 
                 
Investments classified as long-term consist of the following:
 
Years Ended December 31,
 
  
      2019      
 
  
      2018      
 
Available-for-sale
investments:
    
     
 
Group insurance contracts
  $
5,854
     $
5,890
 
Cost method investments:
   
     
 
Minority interest in a private company(1)
   
—
     
4,400
 
                 
   $
5,854
     $
10,290
 
                 
 
(1)
During 2019, the Company recognized $4,700 of impairment charges, which included an impairment of $4,400 of a long-term cost method investment in a private company.
Gross Unrealized Gains and (Losses) Aggregated by Investment Category
The following table shows the gross unrealized gains and (losses) aggregated by investment category for
available-for-sale
investments:
As of December 31, 2019:
 
Cost
 
 
Gross
Unrealized
Gains
 
 
Gross
Unrealized
(Losses)
 
 
Estimated
Fair Value
 
Short-term investments:
 
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale
investments:
 
 
 
 
 
 
 
 
 
 
 
 
Time deposits and certificates of deposit
 
$
13,045
 
 
$
—
 
 
$
—
 
 
$
13,045
 
Bankers’ acceptance drafts
 
 
4,043
 
 
 
—
 
 
 
—
 
 
 
4,043
 
Commercial paper
 
 
61,498
 
 
 
—
 
 
 
(293
)
 
 
61,205
 
U.S. treasury obligations
 
 
4,999
 
 
 
1
 
 
 
—
 
 
 
5,000
 
U.S. agency obligations
 
 
26,123
 
 
 
2
 
 
 
(1
)
 
 
26,124
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
$
109,708
 
 
$
3
 
 
$
(294
)
 
$
109,417
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
As of December 31, 2019:
 
Cost
 
  
Gross
Unrealized
Gains
 
  
Gross
Unrealized
(Losses)
 
  
Estimated
Fair Value
 
Long-term investments:
   
     
     
     
 
Available-for-sale
investments:
    
     
     
     
 
Group insurance contracts
  $
5,261
     $
593
     $
—
     $
5,854
  
                                 
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