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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Trading Securities | $ 10,636 | $ 10,168
Derivative liability | 0 | 0
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) | Money Market Funds |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Cash and cash equivalents | 0 | 0
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) | Time Deposits |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Cash and cash equivalents | 0 |
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Trading Securities | 256 | 564
Derivative liability | 49,703 | 9,756
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Money Market Funds |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Cash and cash equivalents | 62,657 | 13,653
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Time Deposits |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Cash and cash equivalents | 2,121 |
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Trading Securities | 0 | 0
Derivative liability | 0 | 0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Money Market Funds |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Cash and cash equivalents | 0 | 0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Time Deposits |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Cash and cash equivalents | 0 |
Estimated Fair Value |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Trading Securities | 10,892 | 10,732
Derivative liability | 49,703 | 9,756
Estimated Fair Value | Money Market Funds |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Cash and cash equivalents | 62,657 | $ 13,653
Estimated Fair Value | Time Deposits |  |
Assets and liabilities carried at fair value measured on a recurring basis |  |
Cash and cash equivalents | $ 2,121 |

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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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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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