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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock-based Compensation Expense Included in Operating Expense

Stock-based compensation expense was included in the following operating expense categories as follows (in thousands):

 

 

 

Six Months Ended

June 30,

 

 

Three Months Ended

June 30,

 

 

 

2020

 

 

2021

 

 

2020

 

 

2021

 

Service costs

 

$

22

 

 

$

11

 

 

$

6

 

 

$

3

 

Sales and marketing

 

 

511

 

 

 

450

 

 

 

250

 

 

 

221

 

Product development

 

 

171

 

 

 

185

 

 

 

90

 

 

 

88

 

General and administrative

 

 

1,103

 

 

 

753

 

 

 

499

 

 

 

343

 

Total stock-based compensation

 

$

1,807

 

 

$

1,399

 

 

$

845

 

 

$

655

 

Assumptions to Estimate Fair Value for Stock Options at Grant Date

The following weighted average assumptions were used in determining the fair value of time-vested stock option grants for the periods presented:

 

 

 

Six Months Ended June 30,

 

Three Months Ended June 30,

 

 

 

2020

 

2021

 

2020

 

 

2021

 

Expected life (in years)

 

4.0 - 6.25

 

4.0 - 6.25

 

4.0

 

 

4.0

 

Risk-free interest rate

 

0.17%-1.22%

 

0.64%-1.16%

 

 

0.17

%

 

 

0.68

%

Expected volatility

 

46%-53%

 

50%-57%

 

 

53

%

 

 

57

%

Summary of Stock Option

Stock option activity during the six months ended June 30, 2021 is summarized as follows:

 

 

 

Shares

(in thousands)

 

 

Weighted average

exercise price

 

 

Weighted average

remaining

contractual term

(in years)

 

Balance at December 31, 2020

 

 

3,460

 

 

$

3.82

 

 

 

6.50

 

Options granted

 

 

297

 

 

 

2.12

 

 

 

 

 

Options forfeited

 

 

(57

)

 

 

3.46

 

 

 

 

 

Options expired

 

 

(100

)

 

 

5.84

 

 

 

 

 

Options exercised

 

 

(19

)

 

 

2.63

 

 

 

 

 

Balance at June 30, 2021

 

 

3,581

 

 

$

3.63

 

 

 

6.28

 

Summary of Restricted Stock Awards and Restricted Stock Units

Restricted stock awards and restricted stock unit activity during the six months ended June 30, 2021 is summarized as follows:

 

 

 

Shares/

Units

(in thousands)

 

 

Weighted average

grant date

fair value

 

Unvested balance at December 31, 2020

 

 

1,632

 

 

$

3.18

 

Granted

 

 

172

 

 

 

2.01

 

Vested

 

 

(141

)

 

 

3.31

 

Forfeited

 

 

(186

)

 

 

2.78

 

Unvested balance at June 30, 2021

 

 

1,477

 

 

$

3.08