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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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