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Cash, Cash Equivalents, Marketable Securities, and Restricted Cash
 9 Months Ended
Sep. 30, 2021
Cash, Cash Equivalents, and Short-term Investments [Abstract]  
Cash, Cash Equivalents, Marketable Securities, and Restricted Cash Cash, Cash Equivalents, Marketable Securities, and Restricted Cash
As of September 30, 2021, the Company held $385.9 million in cash and cash equivalents and $171.1 million of marketable securities which are reported at fair value on the Company's Consolidated Balance Sheets. Unrealized holding gains and losses are generally reported within accumulated other comprehensive loss in the Statements of Comprehensive Loss. If a decline in the fair value of a marketable security below the Company's cost basis is determined to be other-than-temporary or if an available-for-sale debt security’s fair value is determined to less than the amortized cost and the Company intends or is more than likely to sell the security before recovery and it is not considered a credit loss, such security is written down to its estimated fair value as a new cost basis and the amount of the write-down is included in earnings as an impairment charge. If the unrealized loss of an available-for-sale debt security is determined to be a result of credit loss the Company would recognize an allowance and the corresponding credit loss would be included in earnings.
The Company regularly invests excess operating cash in deposits with major financial institutions, money market funds, notes issued by the U.S. government, as well as fixed income investments and U.S. bond funds, both of which can be readily purchased and sold using established markets. The Company believes that the market risk arising from its holdings of these financial instruments is mitigated as many of these securities are either government backed or of the highest credit rating. Investments that have original maturities greater than three months but less than one year are classified as current.
Cash, cash equivalents and marketable securities are classified as current unless mentioned otherwise below and consisted of the following:
 As of September 30, 2021
(in thousands)CostGross
Unrealized
Gain		Gross
Unrealized
Loss		Fair
Value
Cash and cash equivalents$385,903 $— $— $385,903 
Corporate debt securities12,143 — (2)12,141 
Commercial paper127,943 14 — 127,957 
Asset-backed securities20,547 2 — 20,549 
U.S. government agency bonds10,009 — — 10,009 
Money market350 — — 350 
Certificates of deposit51 — — 51 
$556,946 $16 $(2)$556,960 
Included in cash and cash equivalents$385,903 $— $— $385,903 
Included in marketable securities171,043 16 (2)171,057 
Total cash, cash equivalents, and marketable securities$556,946 $16 $(2)$556,960 

 As of December 31, 2020
(in thousands)CostGross
Unrealized
Gain		Gross
Unrealized
Loss		Fair
Value
Cash and cash equivalents$163,240 $— $— $163,240 
Corporate debt securities39,525 4 (16)39,513 
Commercial paper217,087 14 (6)217,095 
Asset-backed securities9,420 18 — 9,438 
U.S. government agency bonds53,583 3 (4)53,582 
Money market350 — — 350 
Certificates of deposit51 — — 51 
$483,256 $39 $(26)$483,269 
Included in cash and cash equivalents$163,240 $— $— $163,240 
Included in marketable securities320,016 39 (26)320,029
Total cash, cash equivalents, and marketable securities$483,256 $39 $(26)$483,269 
For the nine months ended September 30, 2021 there were no realized gains or losses. For the fiscal year ended December 31, 2020, there were nominal realized gains. The cost of securities sold is based on the specific identification method.
Unrealized loss positions in the marketable securities as of September 30, 2021 and December 31, 2020 reflect temporary impairments and are not a result of credit loss. Additionally, as these positions have been in a loss position for less than twelve months and the Company does not intend to sell these securities before recovery, the losses are recognized in other comprehensive gain (loss). The fair value of these marketable securities in unrealized loss positions was $13.5 million and $124.9 million as of September 30, 2021 and December 31, 2020, respectively.
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Consolidated Statements of Cash Flows.
(in thousands)September 30, 2021September 30, 2020
Cash and cash equivalents$385,903 $210,631 
Restricted cash3,168 2,794 
Cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows$389,071 $213,425