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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2021
Stock-Based Compensation  
Schedule of stock based compensation expense categories in statement of operations

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Year ended December 31, 

​

    

2021

​

2020

​

2019

Sales and marketing

​

$

961

​

$

696

​

$

164

General and administrative

​

 

1,542

​

 

1,030

​

 

225

Research and development

​

 

1,158

​

 

332

​

 

68

Total stock‑based compensation

​

$

3,661

​

$

2,058

​

$

457

Schedule of stock option activity

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​

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​

​

Weighted

​

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​

​

​

​

​

average

​

​

​

​

Weighted

​

remaining

​

​

Number of

​

average exercise

​

contractual term

​

    

shares

    

price per share

    

(years)

Outstanding at January 1, 2019

 

489,222

​

$

5.84

 

  

Granted

 

978,415

​

 

12.51

 

  

Exercised

 

(2,527)

​

 

5.93

 

  

Early exercised

 

(471)

​

 

5.93

 

  

Canceled/forfeited

 

(43,697)

​

 

8.58

 

  

Outstanding at December 31, 2019

 

1,420,942

​

 

10.35

 

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Granted

 

175,086

​

 

15.03

 

  

Exercised

 

(27,783)

​

 

6.29

 

  

Canceled/forfeited

 

(70,037)

​

 

12.41

 

  

Outstanding at December 31, 2020

​

1,498,208

​

​

10.87

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​

Granted

​

468,000

​

​

14.80

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​

Exercised

​

(77,154)

​

​

7.08

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​

Canceled/forfeited

​

(182,645)

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​

13.08

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​

Outstanding at December 31, 2021

​

1,706,409

​

$

11.88

​

7.36

Vested and expected to vest at December 31, 2021

 

1,657,511

​

$

11.83

 

7.31

Exercisable at December 31, 2021

 

917,602

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$

10.23

 

6.18

Schedule of activity relating to early exercise of stock options

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​

​

​

​

​

Number of

​

    

shares

Unvested balance at January 1, 2019

 

912

Early exercised

 

471

Vested

​

(628)

Unvested balance at December 31, 2019

 

755

Vested

 

(306)

Forfeited

 

(267)

Unvested balance at December 31, 2020

​

182

Vested

​

(153)

Unvested balance at December 31, 2021

 

29

Schedule of weighted average assumptions

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​

​

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Year ended December 31, 

​

​

    

2021

 

2020

 

2019

​

Expected dividend yield

 

—

​

—

​

—

​

Expected volatility

 

63.9

%

59.1

%

55.9

%

Risk‑free interest rate

 

0.99

%

0.87

%

1.82

%

Expected term (in years)

 

6.15

​

5.98

​

6.24

​

Schedule of restricted stock units (RSUs)

The Company’s restricted stock units (“RSUs”) vest based on the terms in each award agreement and generally vest over four years. The following table summarizes restricted stock units for the Plan:

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Number of

​

    

shares

Outstanding at January 1, 2021

​

—

Granted

​

194,232

Vested

​

(12,000)

Canceled/forfeited

​

(19,189)

Outstanding at December 31, 2021

​

163,043