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Investment Securities (Tables)
6 Months Ended
Jun. 30, 2017
Investments Debt And Equity Securities [Abstract]  
Schedule of Investment Securities Classified as Available-for-Sale

Investment securities, all classified as available-for-sale, consisted of the following (in thousands):

 

 

 

June 30, 2017

 

 

 

Amortized

Cost

 

 

Unrealized

Gains

 

 

Unrealized

Losses

 

 

Estimated

Fair

Value

 

U.S. Treasury notes

 

$

31,794

 

 

$

 

 

$

(11

)

 

$

31,783

 

Government sponsored enterprise securities

 

 

62,079

 

 

 

 

 

 

(29

)

 

 

62,050

 

Corporate debt securities

 

 

53,012

 

 

 

 

 

 

(22

)

 

 

52,990

 

Commercial paper

 

 

126,753

 

 

 

2

 

 

 

(47

)

 

 

126,708

 

 

 

$

273,638

 

 

$

2

 

 

$

(109

)

 

$

273,531

 

 

 

 

December 31, 2016

 

 

 

Amortized

Cost

 

 

Unrealized

Gains

 

 

Unrealized

Losses

 

 

Estimated

Fair

Value

 

U.S. Treasury notes

 

$

82,484

 

 

$

6

 

 

$

(3

)

 

$

82,487

 

Government sponsored enterprise securities

 

 

73,789

 

 

 

1

 

 

 

(5

)

 

 

73,785

 

Corporate debt securities

 

 

79,190

 

 

 

 

 

 

(72

)

 

 

79,118

 

Commercial paper

 

 

129,861

 

 

 

165

 

 

 

 

 

 

130,026

 

 

 

$

365,324

 

 

$

172

 

 

$

(80

)

 

$

365,416