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Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]  
Amortized Cost Basis, Aggregate Fair Value, Unrealized (Gains)/Losses and Net Carrying Value of Investments in Held-to-maturity Securities The following table provides the amortized cost basis, aggregate fair value, unrealized gains/losses, and the net carrying value of investments in held-to-maturity securities as of March 31, 2019:

 

 

March 31, 2019

 

 

Amortized

 

 

Aggregate

 

 

Unrealized

 

 

Unrealized

 

 

Net Carrying

 

 

Cost

 

 

Fair Value

 

 

Gains

 

 

Losses

 

 

Value

 

Marketable securities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds/notes

$

10,823,308

 

 

$

10,832,228

 

 

$

—

 

 

$

(8,920

)

 

$

10,823,308

 

Commercial paper

 

25,819,617

 

 

 

25,819,617

 

 

 

—

 

 

 

—

 

 

 

25,819,617

 

U.S. government agency securities

 

11,913,633

 

 

 

11,916,320

 

 

 

—

 

 

 

(2,687

)

 

 

11,913,633

 

Marketable securities current total

$

48,556,558

 

 

$

48,568,165

 

 

$

—

 

 

$

(11,607

)

 

$

48,556,558

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2018

 

 

Amortized

 

 

Aggregate

 

 

Unrealized

 

 

Unrealized

 

 

Net Carrying

 

 

Cost

 

 

Fair Value

 

 

Gains

 

 

Losses

 

 

Value

 

Marketable securities:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds/notes

$

16,054,071

 

 

$

16,050,462

 

 

$

3,609

 

 

$

—

 

 

$

16,054,071

 

Commercial paper

 

17,756,394

 

 

 

17,756,394

 

 

 

—

 

 

 

—

 

 

 

17,756,394

 

U.S. government agency securities

 

3,951,974

 

 

 

3,951,040

 

 

 

934

 

 

 

—

 

 

 

3,951,974

 

Marketable securities current total

$

37,762,439

 

 

$

37,757,896

 

 

$

4,543

 

 

$

—

 

 

$

37,762,439