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Cash and Marketable Securities
3 Months Ended
Mar. 31, 2021
Cash and Cash Equivalents [Abstract]  
Cash and Marketable Securities CASH AND MARKETABLE SECURITIES
Cash, Cash Equivalents and Restricted Cash
A reconciliation of cash, cash equivalents, and restricted cash reported within the condensed consolidated balance sheets to the amount reported within the condensed consolidated statements of cash flows is shown in the table below (in thousands):
March 31, 2021December 31, 2020March 31, 2020December 31, 2019
Cash and cash equivalents$309,324 $134,669 $32,191 $38,223 
Restricted cash269 270 242 256 
Total cash, cash equivalents, and restricted cash at the end of the period$309,593 $134,939 $32,433 $38,479 
Marketable Securities
All marketable securities were considered held-to-maturity at March 31, 2021 and December 31, 2020. As of March 31, 2021 and December 31, 2020, some of the Company’s marketable securities were in an unrealized loss position. The Company determined that it had the positive intent and ability to hold until maturity all marketable securities that have been in a continuous loss position, thus there was no recognition of any other-than-temporary impairment as of March 31, 2021 and December 31, 2020. All marketable securities with unrealized losses as of each balance sheet date have been in a loss position for less than twelve months.
The amortized cost, gross unrealized holding losses, and fair value of the Company’s marketable securities by major security type at each balance sheet date are summarized in the table below (in thousands):

March 31, 2021
Amortized CostUnrealized Holding LossesFair Value
Short-term marketable securities:
Corporate debt securities$64,963 $(66)$64,897 
Total short-term marketable securities$64,963 $(66)$64,897 

December 31, 2020
Amortized CostUnrealized Holding LossesFair Value
Short-term marketable securities:
Corporate debt securities$90,034 $(136)$89,898 
Total short-term marketable securities$90,034 $(136)$89,898 

Contractual maturities of the short-term marketable securities all mature within one year as of March 31, 2021.