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Short-term Investments | 6 Months Ended
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Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Short-term Investments | Short-term Investments Short-term investments at June 30, 2021 consisted of mutual funds, U.S. treasury securities, certificates of deposit and U.S. agency mortgage-backed securities. Short-term investments at December 31, 2020 consisted of mutual funds, certificates of deposit and U.S. agency mortgage-backed securities. Short-term investments are recorded at fair value, based on current market valuations. Unrealized gains and losses on the Company's short-term debt investments are excluded from earnings and reported as a separate component of other comprehensive loss until realized. Realized gains and losses and unrealized gains and losses on available-for-sale equity securities are included in non-operating other income (expense) on the condensed consolidated statements of operations and are derived using the specific identification method for determining the cost of the securities sold. During the three and six months ended June 30, 2021, the Company recorded gross realized gain on investments of $358,000 and $358,000, respectively, and gross realized loss on investments of $194,000 and $204,000, respectively. During the three and six months ended June 30, 2020, the Company recorded gross realized gain on investments of $585,000 and $635,000, respectively, and gross realized loss on investments of $686,000 and $1.2 million, respectively. During the three and six months ended June 30, 2021, the Company recorded net unrealized gain (loss) on available-for-sale equity securities of $136,000 and $(711,000), respectively. During the three and six months ended June 30, 2020, the Company recorded net unrealized gain (loss) on available-for-sale equity securities of $4.4 million and $(691,000), respectively. No material balances were reclassified out of accumulated other comprehensive income (loss) for the three and six months ended June 30, 2021 and 2020. Interest and dividends on investments classified as available-for-sale are included in interest income in the condensed consolidated statements of operations. As of June 30, 2021, the Company had 22 available-for-sale securities in an unrealized loss position, of which four with an aggregate total unrealized loss of $211,000 were in such position for longer than 12 months. The following is a summary of available-for-sale securities as of June 30, 2021 and December 31, 2020:
|  |  | As of June 30, 2021
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 207,475,699 |  |  | $ | 1,563,089 |  |  | $ | (579,056) |  |  | $ | 208,459,732 |
U.S. treasury securities | Less than 1 |  | 170,203,940 |  |  | 10,943 |  |  | (4,754) |  |  | 170,210,129 |
Certificates of deposit | Less than 1 |  | 2,972,816 |  |  | 25,684 |  |  | — |  |  | 2,998,500 |
U.S. agency mortgage-backed securities | * |  | 3,130,877 |  |  | 2,782 |  |  | (49,638) |  |  | 3,084,021 |
|  |  | $ | 383,783,332 |  |  | $ | 1,602,498 |  |  | $ | (633,448) |  |  | $ | 384,752,382 |
|  |  | As of December 31, 2020
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 153,177,675 |  |  | $ | 2,339,639 |  |  | $ | (644,140) |  |  | $ | 154,873,174 |
Certificates of deposit | Less than 1 |  | 3,000,000 |  |  | 26,260 |  |  | (10,000) |  |  | 3,016,260 |
U.S. agency mortgage-backed securities | * |  | 3,062,256 |  |  | — |  |  | (36,755) |  |  | 3,025,501 |
Total investments |  |  | $ | 159,239,931 |  |  | $ | 2,365,899 |  |  | $ | (690,895) |  |  | $ | 160,914,935 |
*No single maturity date. The Company periodically reviews its portfolio of available-for-sale debt securities to determine if any investment is impaired due to credit loss or other potential valuation concerns. For the debt securities where the fair value of the investment is less than the amortized cost basis, the Company has assessed at the individual security level for various quantitative factors including, but not limited to, the nature of the investments, changes in credit ratings, interest rate fluctuations, industry analyst reports, and the severity of impairment. Unrealized losses on available-for-sale debt securities as of June 30, 2021 were primarily due to changes in interest rates, and not due to increased credit risks associated with specific securities. The Company does not intend to sell these investments and it is not more likely than not that the Company will be required to sell the investments before recovery of their amortized cost basis, which may be at maturity. Based on the credit quality of the available-for-sale debt securities that are in an unrealized loss position, and the Company’s estimates of future cash flows to be collected from those securities, the Company believes the unrealized losses are not credit losses. Accordingly, at June 30, 2021, the Company has not recorded an allowance for credit losses related to its available-for-sale debt securities.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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