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Investments (Tables)
 12 Months Ended
Dec. 31, 2018
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,  
           2018                  2017        

Available-for-sale investments:

      

Time deposits and certificates of deposit

    $ 102      $ 9,757  

Bankers’ acceptance drafts

      989        5,330  

Asset-backed securities

      9,113        36,990  

Commercial paper

      19,359        13,750  

Corporate obligations

      9,352        77,821  

Municipal bonds

      —        1,970  

U.S. treasury obligations

      13,298        28,078  

U.S. agency obligations

      21,613        35,738  
  

 

 

     

 

 

  
   $ 73,826      $ 209,434  
  

 

 

     

 

 

  

Investments classified as long-term consist of the following:

 

     Years Ended December 31,  
           2018                  2017        

Available-for-sale investments:

      

Group insurance contracts

    $ 5,890      $ 6,255  

Cost method investments:

      

Minority interest in a private company

      4,400        4,400  
  

 

 

     

 

 

  
   $ 10,290      $ 10,655  
  

 

 

     

 

 

  
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, 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  
  

 

 

     

 

 

     

 

 

     

 

 

  

 

As of December 31, 2017:

    Cost      Gross
Unrealized
Gains		      Gross
Unrealized
(Losses)		      Estimated
Fair Value		  

Short-term investments:

            

Available-for-sale investments:

            

Time deposits and certificates of deposit

    $ 9,756      $ 1      $ —      $ 9,757  

Bankers’ acceptance drafts

      5,330        —        —        5,330  

Asset-backed securities

      37,017        15        (42 )       36,990  

Commercial paper

      13,810        —        (60 )       13,750  

Corporate obligations

      77,788        58        (25 )       77,821  

Municipal bonds

      1,970        —        —        1,970  

U.S. treasury obligations

      28,054        24        —        28,078  

U.S. agency obligations

      35,728        10        —        35,738  
  

 

 

     

 

 

     

 

 

     

 

 

  
   $ 209,453      $ 108      $ (127 )     $ 209,434  
  

 

 

     

 

 

     

 

 

     

 

 

  

 

As of December 31, 2017:

    Cost      Gross
Unrealized
Gains		      Gross
Unrealized
(Losses)		      Estimated
Fair  Value		  

Long-term investments:

            

Available-for-sale investments:

            

Group insurance contracts

    $ 6,006      $ 249      $ —      $ 6,255