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Marketable Securities (Notes)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities MARKETABLE SECURITIES

The Company's investments in marketable securities are stated at fair value and are available-for-sale. For the year ended December 31, 2019, the Company had no investments in marketable securities. The following table summarizes the Company's investments in marketable securities for the year ended December 31, 2018:
 
December 31, 2018
 
Maturity
 
Gross Amortized Cost
 
Total Unrealized Gains
 
Total Unrealized Losses
 
Fair Value
Commercial paper
Within one year
 
$
22,886

 
$
—

 
$
(14
)
 
$
22,872

Corporate bonds
Within one year
 
28,074

 
—

 
(14
)
 
28,060

Total
 
 
$
50,960

 
$
—

 
$
(28
)
 
$
50,932