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Employee Incentive and Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Postemployment Benefits [Abstract]  
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  
 March 31,
 
2016
 
2015
Stock options
$
7,657

 
$
7,086

RSUs
5,126

 
481

ESPP
388

 
479

Stock issued related to acquisition
1,850

 
3,547

Total stock-based compensation expense
$
15,021

 
$
11,593
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  
 March 31,
 
2016
 
2015 (1)
Sales and marketing
$
1,904

 
$
1,508

Origination and servicing
746

 
606

Engineering and product development
3,723

 
1,798

Other general and administrative
8,648

 
7,681

Total stock-based compensation expense
$
15,021

 
$
11,593

(1) 
Prior period amounts have been reclassified to conform to the current period presentation. See “Note 1 – Basis of Presentation” for additional information.
Options Activity Under Option Plan
The following table summarizes the activities for the Company's stock options during the first quarter of 2016:
 
Number of Options
 
Weighted-
Average
Exercise Price Per Share
 
Weighted-Average Remaining Contractual Life (in years)
 
Aggregate Intrinsic Value (1)
Outstanding at December 31, 2015
48,208,911

 
$
3.60

 
 
 
 
Granted
4,547,230

 
$
8.48

 
 
 
 
Exercised
(3,822,799
)
 
$
1.26

 
 
 
 
Forfeited/Expired
(478,682
)
 
$
6.97

 
 
 
 
Outstanding at March 31, 2016
48,454,660

 
$
4.21

 
7.1
 
$
221,874

Vested and expected to vest at March 31, 2016
48,091,745

 
$
4.20

 
7.1
 
$
220,963

Exercisable at March 31, 2016
26,444,648

 
$
2.36

 
6.2
 
$
163,676

(1)
The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the Company’s closing stock price of $8.30 as reported on the New York Stock Exchange on March 31, 2016.
Black-Scholes Option Pricing Model to Estimate Fair Value of Stock Options Granted
The Company uses the Black-Scholes option pricing model to estimate the fair value of stock options granted with the following assumptions:
 
 
Three Months Ended  
 March 31,
 
 
2016
 
2015
Expected dividend yield
 
—

 
—

Weighted-average assumed stock price volatility
 
51.9
%
 
49.9
%
Weighted-average risk-free interest rate
 
1.39
%
 
1.56
%
Weighted-average expected life (in years)
 
6.18

 
6.25
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 quarter of 2016:
 
Number of RSUs
 
Weighted-
Average
Grant Date
Fair Value
Unvested at December 31, 2015
4,443,399

 
$
15.23

RSUs granted
9,168,791

 
$
8.41

RSUs vested
(106,836
)
 
$
18.61

RSUs forfeited/expired
(404,127
)
 
$
10.83

Unvested at March 31, 2016
13,101,227

 
$
10.56

Expected to vest after March 31, 2016
12,751,261

 
$
10.53