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Employee Incentive and Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
Stock-based compensation expense was as follows for the periods presented:
 
 
Three Months Ended  
 September 30,
 
Nine Months Ended 
 September 30,
 
 
2015
 
2014
 
2015
 
2014
Stock options
 
$
8,101

 
$
6,996

 
$
23,314

 
$
19,484

ESPP
 
491

 
—

 
1,416

 
—

RSUs
 
3,037

 
—

 
5,262

 
—

Stock issued related to acquisition
 
1,850

 
3,541

 
7,566

 
6,405

Total stock-based compensation expense
 
$
13,479

 
$
10,537

 
$
37,558

 
$
25,889
Schedule of Stock-Based Compensation Expense Recorded for Stock Options, Warrants and Series F Convertible Preferred Stock
The following table presents the Company's stock-based compensation expense recorded in the condensed consolidated statements of operations:
 
 
Three Months Ended  
 September 30,
 
Nine Months Ended 
 September 30,
 
 
2015
 
2014
 
2015
 
2014
Sales and marketing
 
$
2,048

 
$
912

 
$
5,373

 
$
5,029

Origination and servicing
 
817

 
599

 
2,405

 
1,427

General and administrative:
 
 
 
 
 
 
 
 
   Engineering and product development
 
2,554

 
1,492

 
6,392

 
3,487

   Other
 
8,060

 
7,534

 
23,388

 
15,946

Total stock-based compensation expense
 
$
13,479

 
$
10,537

 
$
37,558

 
$
25,889
Black-Scholes Option Pricing Model to Estimate Fair Value of Stock Options Granted
The Company used the following assumptions in the Black-Scholes option pricing model to estimate the fair value of stock options granted during the periods presented:
 
 
Three Months Ended  
 September 30,
 
Nine Months Ended 
 September 30,
 
 
2015
 
2014
 
2015
 
2014
Expected dividend yield
 
—

 
—

 
—

 
—

Weighted-average assumed stock price volatility
 
48.7
%
 
50.5
%
 
49.4
%
 
54.0
%
Weighted-average risk-free rate
 
1.67
%
 
1.87
%
 
1.61
%
 
1.91
%
Weighted-average expected life (in years)
 
6.25

 
6.25

 
6.25

 
6.38
Options Activity Under Option Plan
The following table summarizes the activities for the Company's stock options during the first nine months of 2015:
 
 
Number of Options
 
Weighted-
Average
Exercise Price Per Share
 
Weighted-Average Remaining Contractual Life (in years)
 
Aggregate Intrinsic Value
Outstanding at December 31, 2014
 
57,386,829

 
$
3.15

 
 
 
 
Options granted
 
1,164,929

 
$
20.00

 
 
 
 
Options exercised
 
(5,407,540
)
 
$
1.46

 
 
 
 
Options forfeited/expired
 
(1,844,875
)
 
$
6.45

 
 
 
 
Outstanding at September 30, 2015
 
51,299,343

 
$
3.59

 
7.3
 
$
503,203

Vested and expected to vest at September 30, 2015
 
50,807,451

 
$
3.54

 
7.3
 
$
500,401

Exercisable at September 30, 2015
 
26,216,233

 
$
1.58

 
6.5
 
$
306,781
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes the activities for the Company's RSUs during the first nine months of 2015:
 
Number of RSUs
 
Weighted-
Average
Grant Date
Fair Value
Unvested at December 31, 2014
—

 
$
—

RSUs granted
3,518,967

 
$
16.60

RSUs vested
(99,300
)
 
$
20.29

RSUs forfeited/expired
(106,694
)
 
$
19.53

Unvested at September 30, 2015
3,312,973

 
$
16.39

Expected to vest after September 30, 2015
3,177,419

 
$
16.42
Available for ESPP  
Black-Scholes Option Pricing Model to Estimate Fair Value of Stock Options Granted
We used the following assumptions in estimating the fair value of the grant under the ESPP on June 11, 2015, which are derived using the same methodology applied to stock option assumptions:
Expected dividend yield
—

Weighted-average assumed stock price volatility
38.8
%
Weighted-average risk-free rate
0.10
%
Weighted-average expected life (in years)
0.42