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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table summarizes the changes in each component of accumulated other comprehensive income (loss), net of tax, for 2021:
|  | Unrealized gains (losses) on short-term investments |  | Total
Balance at December 31, 2020 |  | $ | 83 |  |  | $ | 83 |
Other comprehensive loss before reclassifications |  | (51) |  |  | (51) |
Net current period other comprehensive loss |  | (51) |  |  | (51) |
Balance at March 31, 2021 |  | $ | 32 |  |  | $ | 32 |
Other comprehensive income (loss) before reclassifications |  | (27) |  |  | (27) |
Net current period other comprehensive income |  | (27) |  |  | (27) |
Balance at June 30, 2021 |  | $ | 5 |  |  | $ | 5 |
Other comprehensive income (loss) before reclassifications |  | (5) |  |  | (5) |
Net losses (gains) reclassified from accumulated other comprehensive loss |  | (1) |  |  | (1) |
Net current period other comprehensive income |  | (6) |  |  | (6) |
Balance at September 30, 2021 |  | $ | (1) |  |  | $ | (1) |
The net gain reclassified from accumulated other comprehensive loss during the three months ended September 30, 2021 resulted from available-for-sale securities that were called prior to maturity and no gains or losses were recognized for the three and nine months ended September 30, 2021. The basis on which the cost of the securities was determined was specific identification. Proceeds related to these sales were $4,000. The following table summarizes the changes in each component of accumulated other comprehensive income (loss), net of tax, for 2020:
|  | Unrealized gains (losses) on short-term investments |  | Total
Balance at December 31, 2019 |  | $ | (27) |  |  | $ | (27) |
Other comprehensive income before reclassifications |  | 10 |  |  | 10 |
Net current period other comprehensive income |  | 10 |  |  | 10 |
Balance at March 31, 2020 |  | $ | (17) |  |  | $ | (17) |
Other comprehensive income (loss) before reclassifications |  | 352 |  |  | 352 |
Net losses (gains) reclassified from accumulated other comprehensive loss |  | 3 |  |  | 3 |
Net current period other comprehensive income |  | 355 |  |  | 355 |
Balance at June 30, 2020 |  | $ | 338 |  |  | $ | 338 |
Other comprehensive income (loss) before reclassifications |  | (138) |  |  | (138) |
Net current period other comprehensive income |  | (138) |  |  | (138) |
Balance at September 30, 2020 |  | $ | 200 |  |  | $ | 200 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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