Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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.

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Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Fair Value - Schedule of Financial Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Assets:
Restricted cash, current		$ 434	$ 1,539
Restricted cash, non-current	$ 1,460
Total assets measured and recorded at fair value	2,084,733	1,093,249
Level 1
Assets:
Restricted cash, current		434
Restricted cash, non-current	1,460
Total assets measured and recorded at fair value	2,084,733	1,093,249
Cash
Assets:
Cash and cash equivalents	1,811,478	1,021,022
Cash \| Level 1
Assets:
Cash and cash equivalents	1,811,478	1,021,022
Money Market Fund
Assets:
Cash and cash equivalents	271,795	71,793
Money Market Fund \| Level 1
Assets:
Cash and cash equivalents	$ 271,795	$ 71,793