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Stock-Based Compensation and Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Assumptions for Estimating Fair Value of Stock Options
The following table summarizes the assumptions used for estimating the fair value of stock options granted under our equity plans for the years ended December 31:
 
2018
 
2017
Risk-free interest rate
2.82% - 3.13 %
 
2.32% - 2.42 %
Expected term (years)
5.3
 
5.0
Expected volatility
35% - 37%
 
42% - 44%
Dividend yield
—%
 
—%
Weighted-average grant date fair value per share
$2.12
 
$1.66
Summary of Option Activity
The following is a summary of option activity for the year ended December 31, 2019:
 
Number of
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at January 1, 2019
7,932,782

 
$
5.86

 
—

 
—

Exercised
(528,006
)
 
$
2.33

 
—

 
—

Expired
(582,557
)
 
$
11.16

 
—

 
—

Outstanding at December 31, 2019
6,822,219

 
$
5.68

 
5.1

 
$
8,648

Exercisable at December 31, 2019
6,133,031

 
$
5.68

 
4.8

 
$
8,648

Vested or expected to vest as of December 31, 2019
6,789,430

 
$
5.68

 
5.1

 
$
8,648
Schedule of Activities of RSUs
The following table is a summary of activity in RSUs and Performance Restricted Stock Units, or PRSUs for the year ended December 31, 2019:
 
Number of RSUs and PRSUs
 
Weighted-Average Grant Date Fair Value Per Share
Unvested at January 1, 2019
3,307,561

 
$
6.00

RSUs and PRSUs Granted
2,733,080

 
$
5.13

RSUs and PRSUs Vested
(1,142,074
)
 
$
6.55

RSUs and PRSUs Forfeited/Expired
(713,007
)
 
$
5.79

Unvested at December 31, 2019
4,185,560

 
$
5.32

Expected to vest after December 31, 2019
3,420,164

 
$
5.36
Schedule of Assumptions for Stock Purchase Rights Granted Under ESPP
The assumptions used to calculate our Black-Scholes-Merton Option Pricing Model for each stock purchase right granted under the ESPP were as follows for the year ended December 31:
 
2019
 
2018
 
2017
Risk-free interest rate
1.84
%
 
2.10
%
 
1.17
%
Expected term (years)
0.67

 
0.50

 
0.50

Expected volatility
42
%
 
47
%
 
37
%
Schedule of Stock-based Compensation Expense
 
2019
 
2018
 
2017
Sales and marketing
$
1,709

 
$
2,012

 
$
2,429

Technology and analytics
3,050

 
2,647

 
2,300

Processing and servicing
426

 
385

 
483

General and administrative
5,781

 
6,775

 
7,303

Total
$
10,966

 
$
11,819

 
$
12,515