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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial data
The following is a summary of selected quarterly financial data for the years ended December 31, 2015 and 2014: 
 
 
Quarter 
2015
 
First
 
Second
 
Third
 
Fourth
Revenue (a)
 
$
19,939,876

 
$
9,552,589

 
$
9,683,226

 
$
9,395,300

Gross profit
 
17,529,634

 
6,893,803

 
7,257,275

 
7,208,145

Net income (loss) attributable to common stockholders
 
4,934,176

 
(2,998,645
)
 
(2,922,694
)
 
(2,295,014
)
Basic net income (loss) per share attributable to common stockholders
 
$
0.12

 
$
(0.07
)
 
$
(0.07
)
 
$
(0.06
)
Diluted net income (loss) per share attributable to common stockholders
 
$
0.10

 
$
(0.07
)
 
$
(0.07
)
 
$
(0.06
)
 
 
Quarter
2014
 
First
 
Second
 
Third
 
Fourth
Revenue
 
$
12,001,499

 
$
11,302,667

 
$
11,175,440

 
$
11,793,909

Gross profit
 
9,327,124

 
8,595,004

 
8,583,096

 
9,137,575

Net (loss) income attributable to common stockholders (b)
 
(3,104,078
)
 
1,023,512

 
(3,545,218
)
 
(2,827,016
)
Basic net (loss) income per share attributable to common stockholders
 
$
(0.06
)
 
$
0.02

 
$
(0.08
)
 
$
(0.06
)
Diluted net (loss) income per share attributable to common stockholders
 
$
(0.06
)
 
$
0.02

 
$
(0.08
)
 
$
(0.06
)

 
The sum of the quarterly net income (loss) per share amounts do not necessarily equal the annual amount reported, as per share amounts are computed independently for each quarter and the annual period based on the weighted average common shares outstanding in each period.
 
(a)
Revenue in the first quarter of 2015 includes revenue of $11.3 million from our joint development agreement.

(b)
Net income attributable to common stockholders in the second quarter of 2014 includes a gain of $5.3 million related to the Estate litigation settlement.