Amortized
Cost

Gross
Unrealized
Gains

Gross
Unrealized
(Losses)

Fair Value

March 31, 2013

Cash

$

622,831

$

—

$

—

$

622,831

Cash equivalents

6,608,247

—

6,608,247

Marketable securities, current

9,818,948

—

(1,439

)

9,817,509

Total cash, cash equivalents, and marketable securities

$

17,050,026

$

—

$

(1,439

)

$

17,048,587

December 31, 2012

Cash

$

254,267

$

—

$

—

$

254,267

Cash equivalents

8,217,259

—

(252

)

8,217,007

Marketable securities, current

13,901,782

—

(1,104

)

13,900,678

Total cash, cash equivalents, and marketable securities

$

22,373,308

$

—

$

(1,356

)

$

22,371,952