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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
Stock-based compensation cost that has been expensed in the statements of operations amounted to $1.2 million and $1.9 million for the years ended December 31, 2015 and 2014, allocated as follows:
 
 
 
Year Ended
December 31,
 
 
 
2015
 
2014
 
 
 
 
 
 
 
 
 
Research and development
 
$
287,491
 
$
579,711
 
General and administrative
 
 
862,927
 
 
1,313,124
 
 
 
$
1,150,418
 
$
1,892,835
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
For options granted in 2015 and 2014, the Company calculated the fair value of each option grant on the respective dates of grant using the following weighted average assumptions:
 
 
 
2015
 
 
2014
 
Expected term
 
 
5.75 years
 
 
 
5.87 years
 
Risk-free interest rate
 
 
1.63
%
 
 
1.75
%
Expected dividend yield
 
 
 
 
 
 
Expected volatility
 
 
81.39
%
 
 
76.30
%
Fair Value Measurements, Nonrecurring [Table Text Block]
The following table presents the placement in the fair value hierarchy of assets and liabilities that are measured at fair value on a recurring basis at December 31, 2015:
 
 
 
December 31,
 
Fair value measurements at reporting date using
 
 
 
2015
 
Level 1 inputs
 
Level 2 inputs
 
Level 3 inputs
 
 
 
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash equivalents - money market funds
 
$
127,905
 
$
127,905
 
$
-
 
$
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Government notes
 
 
802,112
 
 
802,112
 
 
-
 
 
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds and notes
 
 
23,973,308
 
 
-
 
 
23,973,308
 
 
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
$
24,903,325
 
$
930,017
 
$
23,973,308
 
$
-
 
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of basic and diluted earnings (loss) per share of common stock for the years ended December 31, 2015 and 2014.
 
 
 
Year Ended December 31,
 
 
 
2015
 
2014
 
Basic loss per share attributable to common stock:
 
 
 
 
 
 
 
Numerator
 
 
 
 
 
 
 
Net loss
 
$
(18,208,378)
 
$
(20,372,676)
 
 
 
 
 
 
 
 
 
Denominator
 
 
 
 
 
 
 
Weighted avg. common shares outstanding
 
 
16,470,814
 
 
12,766,295
 
 
 
 
 
 
 
 
 
Basic loss per share attributable to common stock
 
$
(1.11)
 
$
(1.60)
 
 
 
 
 
 
 
 
 
Diluted loss per share attributable to common stock:
 
 
 
 
 
 
 
Numerator
 
 
 
 
 
 
 
Net loss
 
$
(18,208,378)
 
$
(20,372,676)
 
 
 
 
 
 
 
 
 
Denominator
 
 
 
 
 
 
 
Weighted avg. common shares outstanding
 
 
16,470,814
 
 
12,766,295
 
 
 
 
 
 
 
 
 
Diluted loss per share attributable to common stock
 
$
(1.11)
 
$
(1.60)
 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
The computation of diluted earnings per share for the years ended December 31, 2015 and 2014 does not include the following unvested restricted stock awards, restricted stock units, stock options and warrants to purchase shares in the computation of diluted earnings per share because these instruments were antidilutive:
 
 
 
December 31,
 
 
 
2015
 
2014
 
Stock options
 
 
1,722,552
 
 
1,528,737
 
Unvested restricted stock
 
 
3,000
 
 
7,000
 
Warrants
 
 
-
 
 
20,467