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Marketable Securities and Fair Value Measurements - Schedule of Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial Assets |  |
Marketable Securities | $ 74,851 | $ 84,180
Total | 158,132 | 129,922
Level 1 |  |
Financial Assets |  |
Total | 83,281 | 45,742
Level 2 |  |
Financial Assets |  |
Total | 74,851 | 84,180
Cash |  |
Financial Assets |  |
Cash and Cash Equivalents | 62,388 | 35,546
Cash | Level 1 |  |
Financial Assets |  |
Cash and Cash Equivalents | 62,388 | 35,546
Cash equivalents |  |
Financial Assets |  |
Cash and Cash Equivalents | 20,893 | 10,196
Cash equivalents | Level 1 |  |
Financial Assets |  |
Cash and Cash Equivalents | 20,893 | 10,196
Certificates of deposit |  |
Financial Assets |  |
Marketable Securities | 2,150 | 10,558
Certificates of deposit | Level 2 |  |
Financial Assets |  |
Marketable Securities | 2,150 | 10,558
Corporate securities |  |
Financial Assets |  |
Marketable Securities | 45,145 | 51,951
Corporate securities | Level 2 |  |
Financial Assets |  |
Marketable Securities | 45,145 | 51,951
U.S. Treasury and agency securities |  |
Financial Assets |  |
Marketable Securities | 9,505 | 9,225
U.S. Treasury and agency securities | Level 2 |  |
Financial Assets |  |
Marketable Securities | 9,505 | 9,225
Commercial paper |  |
Financial Assets |  |
Marketable Securities | 12,136 | 500
Commercial paper | Level 2 |  |
Financial Assets |  |
Marketable Securities | 12,136 | 500
Asset-backed securities |  |
Financial Assets |  |
Marketable Securities | 5,915 | 11,946
Asset-backed securities | Level 2 |  |
Financial Assets |  |
Marketable Securities | $ 5,915 | $ 11,946

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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