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Cash, Cash Equivalents and Investments (Tables)
 9 Months Ended
Sep. 30, 2019
Cash and Cash Equivalents [Abstract]  
Summary of Cash, Cash Equivalents and Investments
A summary of the Company's cash equivalents and investments as of September 30, 2019 is as follows:
Cash Equivalents:
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Money market funds
 
$
85,195

 
$
—

 
$
—

 
$
85,195

 
 
 
 
 
 
 
 
 
Investments:
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
U.S. government agency bonds
 
$
502

 
$
—

 
$
—

 
$
502

Corporate bonds and commercial paper
 
34,817

 
139

 
(7
)
 
34,949

Certificates of deposit
 
245

 
—

 
—

 
245

 
 
$
35,564

 
$
139

 
$
(7
)
 
$
35,696

A summary of the Company's cash equivalents and investments as of December 31, 2018 is as follows:
Cash Equivalents:
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Money market funds
 
$
54,559

 
$
—

 
$
—

 
$
54,559

 
 
 
 
 
 
 
 
 
Investments:
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
U.S. government agency bonds
 
$
22,330

 
$
—

 
$
(37
)
 
$
22,293

Corporate bonds and commercial paper
 
44,812

 
—

 
(78
)
 
44,734

Certificates of deposit
 
1,952

 
—

 
—

 
1,952

 
 
$
69,094

 
$
—

 
$
(115
)
 
$
68,979
Investments Classified by Contractual Maturity Date
The following table summarizes the estimated fair value of the Company's investments, designated as available-for-sale and classified by the contractual maturity date of the investments as of the dates shown:
 
 
September 30, 2019
 
December 31, 2018
Due within one year or less
 
$
28,038

 
$
61,514

Due after one year through five years
 
7,658

 
7,465

 
 
$
35,696

 
$
68,979
Schedule of Fair Values and Gross Unrealized Losses for Available-For-Sale Securities
The following table shows the fair values and the gross unrealized losses of these available-for-sale investments aggregated by investment category as of September 30, 2019:
 
 
Adjusted Cost
 
Gross Unrealized Loss
 
Fair Value
U.S. government agency bonds
 
$
502

 
$
—

 
$
502

Corporate bonds and commercial paper
 
5,080

 
(7
)
 
5,073

 
 
$
5,582

 
$
(7
)
 
$
5,575


The following table shows the fair values and the gross unrealized losses of these available-for-sale investments aggregated by investment category as of December 31, 2018:
 
 
Adjusted Cost
 
Gross Unrealized Loss
 
Fair Value
U.S. government agency bonds
 
$
22,330

 
$
(37
)
 
$
22,293

Corporate bonds and commercial paper
 
44,812

 
(78
)
 
44,734

 
 
$
67,142

 
$
(115
)
 
$
67,027