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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013 and 2012: 
 
 
Quarter 
2013
 
First
 
Second
 
Third
 
Fourth
Revenue (a)
 
$
15,284,817

 
$
13,974,139

 
$
14,730,038

 
$
14,647,510

Gross profit
 
10,976,760

 
10,149,045

 
10,961,078

 
11,393,807

Net (loss) income attributable to common stockholders (c)
 
(4,380,445
)
 
(5,207,293
)
 
(2,265,599
)
 
576,864

Basic net (loss) income per share attributable to common stockholders
 
(0.09
)
 
(0.11
)
 
(0.05
)
 
0.01

Diluted net (loss) income per share attributable to common stockholders
 
(0.09
)
 
(0.11
)
 
(0.05
)
 
0.01

 
 
Quarter
2012
 
First
 
Second
 
Third
 
Fourth
Revenue (b)
 
$
19,368,072

 
$
16,466,201

 
$
17,089,013

 
$
22,487,683

Gross profit
 
14,186,230

 
11,587,960

 
12,208,096

 
16,766,610

Net loss attributable to common stockholders
 
(2,449,408
)
 
(6,620,586
)
 
(3,568,051
)
 
(2,346,276
)
Basic net loss per share attributable to common stockholders
 
(0.05
)
 
(0.14
)
 
(0.08
)
 
(0.05
)
Diluted net loss per share attributable to common stockholders
 
(0.05
)
 
(0.14
)
 
(0.08
)
 
(0.05
)

 
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)
The Company recorded a benefit (expense) of approximately $0.1 million, $0.0 million, $0.0 million and $(0.1) million during the first, second, third and fourth quarters of 2013, respectively, representing the net impact from changes in accounts receivable allowances. These amounts are included within revenues in each respective period in the accompanying consolidated statements of operations.

(b)
The Company recorded a benefit (expense) of approximately $0.6 million, ($0.3) million, $0.2 million and $0.2 million during the first, second, third and fourth quarters of 2012, respectively, representing the net impact from changes in accounts receivable allowances. These amounts are included within revenues in each respective period in the accompanying consolidated statements of operations.

(c)
Net income in the fourth quarter of 2013 includes a gain on the sale of the Company's cost-method investment of $1.9 million, net of tax which was partly offset by restructuring charges of $1.3 million.