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Fair Value Measurements
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following table summarizes our cash equivalents and marketable securities measured at fair value. Certain marketable securities consist of investments in debt securities. With the exception of money market funds, these investments in debt securities are classified as trading securities. We classify our cash equivalents and marketable securities within Level 1 because we use quoted market prices models utilizing market observable inputs to determine their fair value.

June 30, 2021
Cash and cash equivalents:
Cash $6,211,049 
Money Market Funds11,135,963 
Total cash and cash equivalents17,347,012 
Marketable securities
Debt securities455,726 
Equity securities432,859 
Total marketable securities888,585 
Total cash and cash equivalents and marketable securities$18,235,597 

The gross unrealized gains on our marketable securities was approximately $25 thousand for the three and six months ended June 30, 2021.