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Investments
 3 Months Ended
Mar. 31, 2019
Debt Securities, Available-for-sale [Abstract]  
Investments  Investments
 
Marketable Debt Securities

The following is a summary of our available-for-sale investment securities, excluding marketable equity securities and those securities classified within cash and cash equivalents on the condensed consolidated balance sheets (in thousands):
 
March 31, 2019
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Available-for-sale securities:
 
 
 
 
 
 
 
Commercial paper
$
137,523

 
$
101

 
$
(6
)
 
$
137,618

Corporate notes and bonds
1,405,920

 
2,955

 
(903
)
 
1,407,972

Certificates of deposit
60,337

 
43

 
—

 
60,380

U.S. government and agency securities
91,162

 
49

 
(157
)
 
91,054

Total available-for-sale securities
$
1,694,942

 
$
3,148

 
$
(1,066
)
 
$
1,697,024



 
December 31, 2018
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Available-for-sale securities:
 
 
 
 
 
 
 
Commercial paper
$
108,061

 
$
—

 
$
—

 
$
108,061

Corporate notes and bonds
1,233,589

 
343

 
(4,218
)
 
1,229,714

Certificates of deposit
73,584

 
1

 
—

 
73,585

U.S. government and agency securities
102,549

 
23

 
(358
)
 
102,214

Total available-for-sale securities
$
1,517,783

 
$
367

 
$
(4,576
)
 
$
1,513,574



As of March 31, 2019, the contractual maturities of our investment securities, excluding securities classified within cash and cash equivalents on the condensed consolidated balance sheets, did not exceed 36 months. The fair values of available-for-sale investment securities, by remaining contractual maturity, are as follows (in thousands):
 
March 31, 2019
Due within 1 year
$
1,022,391

Due in 1 year through 5 years
674,633

Total
$
1,697,024


The following table shows the fair values and the gross unrealized losses of these securities, classified by the length of time that the securities have been in a continuous unrealized loss position, and aggregated by investment types, excluding those securities classified within cash and cash equivalents on the condensed consolidated balance sheets (in thousands): 
 
March 31, 2019
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
Commercial paper
$
35,844

 
$
(6
)
 
$
—

 
$
—

 
$
35,844

 
$
(6
)
Corporate notes and bonds
255,199

 
(243
)
 
296,220

 
(660
)
 
551,419

 
(903
)
Certificates of deposit
2,050

 
—

 
—

 
—

 
2,050

 
—

U.S. government and agency securities
3,389

 
—

 
50,156

 
(157
)
 
53,545

 
(157
)
Total
$
296,482

 
$
(249
)
 
$
346,376

 
$
(817
)
 
$
642,858

 
$
(1,066
)


 
December 31, 2018
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
Corporate notes and bonds
$
714,605

 
$
(2,603
)
 
$
294,956

 
$
(1,615
)
 
$
1,009,561

 
$
(4,218
)
Certificates of deposit
1,000

 
—

 
—

 
—

 
1,000

 
—

U.S. government and agency securities
11,756

 
(5
)
 
61,457

 
(353
)
 
73,213

 
(358
)
Total
$
727,361

 
$
(2,608
)
 
$
356,413

 
$
(1,968
)
 
$
1,083,774

 
$
(4,576
)

 As of March 31, 2019, we had a total of 239 available-for-sale securities, excluding those securities classified within cash and cash equivalents on the condensed consolidated balance sheet in an unrealized loss position. There were no impairments considered “other-than-temporary” as it is more likely than not we will hold the securities until maturity or a recovery of the cost basis.

Marketable Equity Securities

During the three months ended March 31, 2018, we recognized $18.5 million of unrealized gains through net income that related to the changes in the fair value of these securities during the three months ended March 31, 2018. As of each of March 31, 2019 and December 31, 2018, we had no marketable equity securities on our condensed consolidated balance sheet.

Strategic Investments

As of March 31, 2019 and December 31, 2018, the total amount of equity investments in privately-held companies included in other assets on our condensed consolidated balance sheets was $14.9 million and $14.6 million, respectively.