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Investments
 12 Months Ended
Dec. 31, 2018
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 consolidated balance sheets (in thousands):
 
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



 
December 31, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Available-for-sale securities:
 
 
 
 
 
 
 
Commercial paper
$
258,348

 
$
1

 
$
(5
)
 
$
258,344

Corporate notes and bonds
1,006,302

 
26

 
(3,084
)
 
1,003,244

Certificates of deposit
33,084

 
—

 
—

 
33,084

U.S. government and agency securities
129,494

 
—

 
(638
)
 
128,856

Total available-for-sale securities
$
1,427,228

 
$
27

 
$
(3,727
)
 
$
1,423,528


As of December 31, 2018, the contractual maturities of our investment securities, excluding securities classified within cash and cash equivalents on the 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):
 
December 31, 2018
Due within 1 year
$
931,718

Due in 1 year through 5 years
581,856

Total
$
1,513,574


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 consolidated balance sheets (in thousands): 
 
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
)


 
December 31, 2017
 
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
$
14,809

 
$
(5
)
 
$
—

 
$
—

 
$
14,809

 
$
(5
)
Corporate notes and bonds
819,113

 
(2,703
)
 
141,874

 
(381
)
 
960,987

 
(3,084
)
U.S. government and agency securities
106,301

 
(593
)
 
22,555

 
(45
)
 
128,856

 
(638
)
Total
$
940,223

 
$
(3,301
)
 
$
164,429

 
$
(426
)
 
$
1,104,652

 
$
(3,727
)


 As of December 31, 2018, we had a total of 522 available-for-sale securities, excluding those securities classified within cash and cash equivalents on the 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

As of December 31, 2017, we had marketable equity securities of $20.7 million. In May 2018, we sold these securities for total proceeds of $40.0 million. We recognized net gains of $19.3 million for the year ended December 31, 2018, resulting from our adoption of ASU 2016-01 as we began to record changes in stock price fluctuations of our marketable equity securities through statement of operations rather than in accumulated other comprehensive income (loss) on our consolidated balance sheet. During the year ended December 31, 2017, prior to the adoption of ASU 2016-01, we recognized $10.7 million of unrealized gains on our marketable equity securities offset by $3.5 million of tax effect through accumulated other comprehensive income (loss) on our consolidated balance sheet. Refer to Note 2 for further details on ASU 2016-01. Upon our sale of these securities, the previously unrealized gain became realized. As of December 31, 2018, we had no marketable equity securities on our consolidated balance sheet.

Strategic Investments

As of December 31, 2018 and 2017, the total amount of equity investments in privately-held companies included in other assets on our consolidated balance sheets was $14.6 million and $4.8 million, respectively. As there have been no material observable price changes, we have not recorded any adjustments resulting from observable price changes or impairment charges for any of our equity investments in privately-held companies.
 
The fair value of our debt investments in privately-held companies included within our strategic investments was $1.0 million as of December 31, 2018 and 2017. These investments are recorded at fair value using significant unobservable inputs or data in an inactive market, and the valuation requires our judgment due to the absence of quoted prices in active markets and inherent lack of liquidity and are categorized accordingly as Level 3 in the fair value hierarchy. There were no significant changes in unrealized gains and losses recognized in other comprehensive income (loss) for these investments.