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Fair Value Measurements | 3 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements The guidance regarding fair value measurements establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets that are accessible at the measurement date; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. Assets are classified based on the lowest level of input that is significant to the fair value measurements. The Company reviews the fair value hierarchy classification on a quarterly basis. Changes in the ability to observe valuation inputs may result in a reclassification of levels for certain securities within the fair value hierarchy. The Company does not have any liabilities measured at fair value on a recurring basis and did not have any transfer of assets or liabilities between Level 1, Level 2 and Level 3 of the fair value hierarchy during the three months ended March 31, 2021 or 2020. The following table presents the Company’s assets that were measured at fair value on a recurring basis, determined using the following inputs as of March 31, 2021:
| Fair Value Measurements at
| March 31, 2021
| Total |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Unobservable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Short-term investments |  |  |  |  |  |  |
Mutual funds | $ | 228,949,156 |  |  | $ | 228,949,156 |  |  | $ | — |  |  | $ | — |
U.S. treasury securities | 200,414,000 |  |  | 200,414,000 |  |  | — |  |  | — |
Certificates of deposit | 2,992,200 |  |  | — |  |  | 2,992,200 |  |  | — |
U.S. agency mortgage-backed securities | 2,614,172 |  |  | — |  |  | 2,614,172 |  |  | — |
Total short-term investments | 434,969,528 |  |  | 429,363,156 |  |  | 5,606,372 |  |  | — |
Investment in affiliated entity | 3,629,891 |  |  | 3,629,891 |  |  | — |  |  | — |
Total assets measured at fair value | $ | 438,599,419 |  |  | $ | 432,993,047 |  |  | $ | 5,606,372 |  |  | $ | — |
The following table presents the Company’s assets that were measured at fair value on a recurring basis, determined using the following inputs as of December 31, 2020:
| Fair Value Measurements at
| December 31, 2020
| Total |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Unobservable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |
U.S. treasury securities | $ | 59,996,800 |  |  | $ | 59,996,800 |  |  | $ | — |  |  | $ | — |
Short-term investments |  |  |  |  |  |  |
Mutual funds | 154,873,174 |  |  | 154,873,174 |  |  | — |  |  | — |
Certificates of deposit | 3,016,260 |  |  |  |  | 3,016,260 |  |  | — |
U.S. agency mortgage-backed securities | 3,025,501 |  |  | — |  |  | 3,025,501 |  |  | — |
Total short-term investments | 160,914,935 |  |  | 154,873,174 |  |  | 6,041,761 |  |  | — |
Investment in affiliated entities | 4,460,366 |  |  | 4,460,366 |  |  | — |  |  | — |
Total assets measured at fair value | $ | 225,372,101 |  |  | $ | 219,330,340 |  |  | $ | 6,041,761 |  |  | $ | — |
Level 1 assets at March 31, 2021 consisted of mutual funds and U.S. treasury securities held by the Company that are valued at quoted market prices, as well as the Company’s investment in its affiliated entity, PLS. The Company accounts for its investment in 597,808 common shares of PLS based on the closing price of the shares on the Korea New Exchange Market on the applicable balance sheet date. Unrealized gains and losses on the Company's equity securities are reported in the condensed consolidated statement of ope rations as unrealized gain (loss) on available-for-sale equity securities or as a gain (loss) on investment in affiliated entities. Level 2 assets at March 31, 2021 consisted of certificates of deposit and U.S. agency mortgage-backed securities held by the Company that are initially valued at the transaction price and subsequently valued, at the end of each reporting period, typically utilizing market observable data. The Company obtains the fair value of its Level 2 assets from a professional pricing service, which may use quoted market prices for identical or comparable instruments, or inputs other than quoted prices that are observable either directly or indirectly. The professional pricing service gathers quoted market prices and observable inputs from a variety of industry data providers. The valuation techniques used to measure the fair value of the Company's Level 2 financial instruments were derived from non-binding market consensus prices that are corroborated by observable market data, quoted market prices for similar instruments, or pricing models such as discounted cash flow techniques. The Company validates the quoted market prices provided by the primary pricing service by comparing the service's assessment of the fair values of the Company's investment portfolio balance against the fair values of the Company's investment portfolio balance obtained from an independent source. There were no Level 3 assets held as of March 31, 2021.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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