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Description of Business, Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]  
Allowance for doubtful accounts
 
Balance at
Beginning of
Period
 
Additions,
Costs and
Expenses
 
Deductions,
Write-Offs
 
Balance at
End of the
Period
Allowance for Doubtful Accounts:
 
 
 
 
 
 
 
Year Ended December 31, 2018
$
527,958

 
$
193,746

 
$
338,125

 
$
383,579

Year Ended December 31, 2017
$
283,000

 
$
304,306

 
$
59,348

 
$
527,958

Year Ended December 31, 2016
$
133,000

 
$
152,587

 
$
2,587

 
$
283,000
Estimated useful lives of assets
Depreciation is recorded using the straight-line method over the estimated useful lives of the assets as follows:

 
Years
Servers, computer equipment and software
1
 
to 
 
3
Office furniture and equipment
3
 
to 
 
5
Leasehold improvements
1
 
to 
 
10
Computation of basic and diluted net income (loss) per share
The following table shows the computation of basic and diluted net income (loss) per share for the following: 
 
For the Year Ended December 31,
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Net income (loss)
$
1,143,388

 
$
(64,591,727
)
 
$
46,268,618

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted-average shares outstanding— basic
73,085,542

 
68,743,956

 
51,963,702

Effect of dilutive securities
2,530,897

 
—

 
5,781,950

Weighted-average shares outstanding— diluted
75,616,439


68,743,956


57,745,652

 
 
 
 
 
 
Basic income (loss) per share
$
0.02

 
$
(0.94
)
 
$
0.89

Diluted income (loss) per share
$
0.02

 
$
(0.94
)
 
$
0.80
Antidilutive securities
The following table summarizes the number of dilutive securities, which may dilute future earnings per share, outstanding for each of the periods presented, but not included in the calculation of diluted loss per share:
 
For the Year Ended December 31,
 
2018
 
2017
 
2016
Stock options
3,236,900

 
5,653,141

 
2,832,961

Unvested restricted stock awards
2,147,885

 
3,534,558

 
—

Unvested PSUs
363,660

 
—

 
—

Warrants
—

 
—

 
345,202

Totals
5,748,445


9,187,699


3,178,163
Finite-Lived Intangible Assets  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives of assets
 
Years
Trademarks
5
 
to
 
10
Domain names
5
 
to 
 
10
Mobile applications, purchased and internally developed
1
 
to 
 
5
Customer relationships
1
 
to 
 
10