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Cash and Cash Equivalents - Schedule of Cash and Cash Equivalents by Significant Investment Category (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
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Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |
Cash | $ 5,411 | $ 2,779 |
Cash and cash equivalents and Short term investments, Amortized cost | 21,458 | 38,173 |
Cash and cash equivalents and Short term investments, Estimated fair value | 21,458 | 38,173 |
Cash and cash equivalents | 21,458 | 38,173 | $ 22,533
Money Market Funds | Level 1 |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |
Cash equivalents | $ 16,047 | $ 35,394 |

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- Definition Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631418-115840 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840 + Details
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