(4) Fair Value Measurements (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Cash equivalents:
Total cash equivalents	$ 12,610,504	$ 4,285,309
Marketable securities:
Total marketable securities	5,764,839	10,530,942
Derivative liabilities:
Total derivative liabilities	170,337	0
Total assets measured at fair value	18,375,343	14,816,251
Fair Value, Inputs, Level 1
Cash equivalents:
Total cash equivalents	12,610,504	4,285,309
Derivative liabilities:
Total assets measured at fair value	12,610,504	4,285,309
Fair Value, Inputs, Level 2
Marketable securities:
Total marketable securities	5,764,839	10,530,942
Derivative liabilities:
Total assets measured at fair value	5,764,839	10,530,942
Fair Value, Inputs, Level 3
Derivative liabilities:
Total derivative liabilities	170,337	0
Money Market Funds
Cash equivalents:
Total cash equivalents	12,610,504	4,285,309
Money Market Funds | Fair Value, Inputs, Level 1
Cash equivalents:
Total cash equivalents	12,610,504	4,285,309
Money Market Funds | Fair Value, Inputs, Level 2
Cash equivalents:
Total cash equivalents	0	0
Money Market Funds | Fair Value, Inputs, Level 3
Cash equivalents:
Total cash equivalents	0	0
Corporate Debt Securities Member
Marketable securities:
Total marketable securities	5,764,839	10,530,942
Corporate Debt Securities Member | Fair Value, Inputs, Level 1
Marketable securities:
Total marketable securities	0	0
Corporate Debt Securities Member | Fair Value, Inputs, Level 2
Marketable securities:
Total marketable securities	5,764,839	10,530,942
Corporate Debt Securities Member | Fair Value, Inputs, Level 3
Marketable securities:
Total marketable securities	0	0
Derivatives
Derivative liabilities:
Total derivative liabilities	170,337
Derivatives | Fair Value, Inputs, Level 1
Derivative liabilities:
Total derivative liabilities	0
Derivatives | Fair Value, Inputs, Level 2
Derivative liabilities:
Total derivative liabilities	0
Derivatives | Fair Value, Inputs, Level 3
Derivative liabilities:
Total derivative liabilities	$ 170,337