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Fair Value Measurements - Hierarchy (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash, cash equivalents and restricted cash	$ 33,671	$ 39,001
Marketable securities-short term	0	11
Marketable securities-long term	0	0
Total assets	33,671	39,012
Liabilities
Total liabilities	0	0
Temporary equity
Redeemable noncontrolling interests	12,500	12,500
Total temporary equity	12,500	12,500
(Level 1)
Assets
Cash, cash equivalents and restricted cash	33,671	39,001
Marketable securities-short term	0	0
Marketable securities-long term	0	0
Total assets	33,671	39,001
Liabilities
Total liabilities	0	0
Temporary equity
Redeemable noncontrolling interests	0	0
Total temporary equity	0	0
(Level 2)
Assets
Cash, cash equivalents and restricted cash	0	0
Marketable securities-short term	0	11
Marketable securities-long term	0	0
Total assets	0	11
Liabilities
Total liabilities	0	0
Temporary equity
Redeemable noncontrolling interests	0	0
Total temporary equity	0	0
(Level 3)
Assets
Cash, cash equivalents and restricted cash	0	0
Marketable securities-short term	0	0
Marketable securities-long term	0	0
Total assets	0	0
Liabilities
Total liabilities	0	0
Temporary equity
Redeemable noncontrolling interests	12,500	12,500
Total temporary equity	$ 12,500	$ 12,500

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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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent.

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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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Fair value of the entity's equity.

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Fair value of financial and nonfinancial obligations.

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Fair value of noncontrolling interests which are redeemable by the parent entity and classified as other equity.

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