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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
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 September 30, 2020:
 
Fair Value Measurements at
 September 30, 2020
 TotalQuoted 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$99,985,000 $99,985,000 $— $— 
Short-term investments
     Mutual funds152,802,199 152,802,199 — — 
     Corporate debt securities1,172,160 1,172,160 — — 
     Certificates of deposit3,032,980 — 3,032,980 — 
     U.S. agency mortgage-backed securities1,528,405 — 1,528,405 — 
Total short-term investments158,535,744 153,974,359 4,561,385 — 
Investment in affiliated entity4,154,049 4,154,049 — — 
Total assets measured at fair value$262,674,793 $258,113,408 $4,561,385 $— 
The following table presents the Company’s assets and liabilities that were measured at fair value on a recurring basis, determined using the following inputs as of December 31, 2019:
 
Fair Value Measurements at
 December 31, 2019
 TotalQuoted Prices
in Active Markets
(Level 1)
Significant
Other Unobservable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Assets:
Cash and cash equivalents
     Money market funds$2,349,729 $2,349,729 $— $— 
Short-term investments
     Mutual funds67,338,017 67,338,017 — — 
Investment in affiliated entities6,315,356 6,315,356 — — 
Total assets measured at fair value$76,003,102 $76,003,102 $— $— 
Liabilities:
Derivative liability (Note 9)$8,819,023 $— $— $8,819,023 
Total liabilities measured at fair value$8,819,023 $— $— $8,819,023 
Schedule of Changes in Fair Value of the Company's Derivative Liability
The following table presents the changes in fair value of the Company's derivative liability for the nine months ended September 30, 2020:
Balance at December 31, 2019$8,819,023 
     Change in fair value 75,670,977 
     Derecognition of the derivative liability upon conversion (84,490,000)
Balance at September 30, 2020$—