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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Fair Value Measurements |  |  |
Amount of transfers of marketable securities within the three level hierarchy | $ 0 |  |
Intangible assets | 1,683 | $ 1,680 |
Recurring |  |  |
Fair Value Measurements |  |  |
Available for sale debt securities | 16,189 | 16,188 |
Recurring | Money market mutual funds |  |  |
Fair Value Measurements |  |  |
Money market mutual funds | 16,189 | 16,188 |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value Measurements |  |  |
Available for sale debt securities | 16,189 | 16,188 |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market mutual funds |  |  |
Fair Value Measurements |  |  |
Money market mutual funds | $ 16,189 | $ 16,188 |
Non-recurring | Significant Unobservable Inputs (Level 3) | Airwear Product |  |  |
Fair Value Measurements |  |  |
Intangible assets |  |  | $ 0

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26626-111562 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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