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Stock-based compensation (Tables)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]    
Schedule of Stock Option Activity Stock option activity for the six months ended June 30, 2021 is as follows:
    
Number of

Shares

Underlying

Outstanding

Options
   
Weighted-

Average Exercise

Price per Share
    
Weighted-

Average

Remaining

Contractual

Term (in years)
    
Aggregate

Intrinsic

Value
 
Outstanding—December 31, 2020
     25,732,503   $ 0.56      9.60      $ 245,746
Options granted
     645,796     10.26      9.80      $ 1,440
Options exercised
     (727,116     0.13      9.00      $ 6,083
Options cancelled
     (432,918     0.15      
  
 
 
         
Outstanding—June 30, 2021
     25,218,265   $ 0.66      9.10      $ 298,358
  
 
 
         
Vested and expected to vest—June 30, 2021
     25,218,265   $ 0.66      9.10      $ 298,358
  
 
 
         
Exercisable—June 30, 2021
     7,406,315   $ 0.29      9.00      $ 90,358
Stock option activity for the years ended December 31, 2019 and 2020 is as follows:
 
    
Number of
Shares
Available
for Grant
   
Number of
Shares
Underlying
Outstanding
Options
   
Weighted-
Average Exercise
Price per Share
    
Weighted-
Average
Remaining
Contractual
Term (in years)
    
Aggregate
Intrinsic
Value
 
Outstanding—January 1, 2019
     184,808       977,513     $ 5.24        9.5      $ 2,943  
Additional shares authorized
     480,283       —            
Options granted
     (913,090     913,090       8.25        7.5        206  
RSA’s granted
     (703     —            
Options exercised
     —         (8,545     5.96        0.5        21  
Options cancelled
     282,413       (282,413     7.31           330  
  
 
 
   
 
 
         
Outstanding—December 31, 2019
     33,712       1,599,645     $ 6.58        8.8      $ 3,020  
Additional shares authorized
     39,526,375       —            
Options granted
     (37,663,242     37,663,242       0.45        9.4        363,941  
RSA’s granted
     (1,617,264     —            
Options exercised
     —         (12,221,364     0.20        9.5        121,106  
Options cancelled
     1,309,020       (1,309,020     1.58           —    
  
 
 
   
 
 
         
Outstanding—December 31, 2020
     1,588,600       25,732,503     $ 0.56        9.6      $ 245,746  
    
 
 
         
Vested and expected to vest—December 31, 2020
       25,732,503     $ 0.56        9.6      $ 245,746  
    
 
 
         
Exercisable—December 31, 2020
       5,135,847     $ 0.28        9.4      $ 50,493  
    
 
 
         
Schedule of Stock Options Valuation Assumptions The following table summarizes the weighted-average assumptions used in estimating the fair value of options granted in the six months ended June 30, 2021, using the Black-Scholes option-pricing model:
    
Six Months Ended

June 30, 2020
 
Expected term (years)
     6.00  
Expected volatility
     63.19
Risk-free interest rate
     1.03
Expected dividend rate
     —  
 
Schedule of Stock Options Outstanding and Exercisable
The following table summarizes information about stock options outstanding and exercisable at June 30, 2021.
 
      
Options Outstanding
    
Options Exercisable
 
Exercise

Price
    
Options

Outstanding
    
Weighted

Average

Remaining

Contractual

Life (Years)
    
Weighted

Average

Exercise

Price
    
Options

Exercisable
    
Weighted

Average

Remaining

Contractual

Life (Years)
    
Weighted

Average

Exercise

Price
 
$ 0.13      6,548,017      8.90      $ 0.13      3,569,978      8.88      $ 0.13
$ 0.15      10,455,884      9.21      $ 0.15      2,537,865      9.08      $ 0.15
$ 0.26      35,159      0.45      $ 0.26      35,159      0.45      $ 0.26
$ 1.00      7,524,116      9.25      $ 1.00      1,254,019      9.25      $ 1.00
$ 3.92      7,976      0.45      $ 3.92      7,976      0.45      $ 3.92
$ 5.80      1,318      0.45      $ 5.80      1,318      0.45      $ 5.80
$ 10.26      645,796      9.78      $ 10.26      —           $ —  
  
 
 
          
 
 
       
     25,218,266            7,406,315      
  
 
 
          
 
 
       
 
Schedule of Nonvested Restricted Stock Awards Activity
A summary of RSA activity under the 2015 Plan is as follows:​​​​​​​
    
Number of

Shares
    
Weighted Average

Grant Date Fair

Value (per share)
 
Unvested – December 31, 2020
     40,754    $ 0.67
Granted during the period
     —          —    
Canceled during the period
     —          —    
Vested during the period
     (11,644      0.67
  
 
 
    
 
 
 
Unvested — June 30, 2021
     29,110    $ 0.67
  
 
 
    
 
 
 
 
Schedule of Stock-based Compensation
The Company recognized stock-based compensation for all stock options in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):​​​​​​​
    
Three Months Ended June 30,
    
Six Months Ended June 30,
 
    
      2021      
    
      2020      
    
      2021      
    
      2020      
 
Cost of revenue
   $ 133    $ 59    $ 251    $ 101
Research and development
     1,321      152      2,242      287
Sales and marketing
     719      39      985      89
General and administrative
     3,981      210      7,932      158
  
 
 
    
 
 
    
 
 
    
 
 
 
Total stock-based compensation
   $ 6,154    $ 460    $ 11,410    $ 635
  
 
 
    
 
 
    
 
 
    
 
 
 
The Company recognized stock-based compensation for all stock options in the stat
e
ments of operations and comprehensive loss as follows (in thousands):
 
    
Year Ended
December 31,
 
    
2019
    
2020
 
Cost of revenue
   $ 58      $ 657  
Research and development
     621        6,059  
Sales and marketing
     140        640  
General and administrative
     474        4,701  
  
 
 
    
 
 
 
Total stock-based compensation
   $ 1,293      $ 12,057  
  
 
 
    
 
 
 
Summarizes Information about stock options outstanding and exercisable  
The following table summarizes information about stock options outstanding and exercisable at December 31, 2020.
 
      
Options Outstanding
    
Options Exercisable
 
Exercise
Price
    
Options
Outstanding
    
Weighted
Average
Remaining
Contractual
Life (Years)
    
Weighted
Average
Exercise
Price
    
Options
Exercisable
    
Weighted
Average
Remaining
Contractual
Life (Years)
    
Weighted
Average
Exercise
Price
 
$ 0.18        7,240,650        9.40      $ 0.18        3,462,757        9.40      $ 0.18  
$ 0.21        10,923,153        9.74      $ 0.21        1,315,002        9.74      $ 0.21  
$ 0.37        35,159        0.45      $ 0.37        35,159        0.45      $ 0.37  
$ 1.42        7,524,116        9.75      $ 1.42        313,505        9.75      $ 1.42  
$ 5.57        7,976        0.45      $ 5.57        7,976        0.45      $ 5.57  
$ 8.42        1,449        0.45      $ 8.42        1,449        0.45      $ 8.42  
  
 
 
          
 
 
       
     25,732,503              5,135,847        
  
 
 
          
 
 
       
Fair Value of Black-Scholes Option Pricing Model  
The fair value of each option is estimated at the date of grant using the Black-Scholes option pricing model, based on the following assumptions:
 
    
Year Ended December 31,
    
2019
  
2020
Expected term (in years)
   6.0    5.0 - 6.1
Risk-free interest rate
   1.5 to 2.4%    0.3 to 1.5%
Expected volatility
   55.3%—58.0%    57.4%—63.3%
Expected dividend rate
   0%    0%
Summary of RSAs activity  
A summary of RSAs activity under the Plan is as follows:
 
    
Number of
Shares
    
Weighted Average

Grant Date Fair
Value (per share)
 
Unvested – January 1, 2020
     34,865      $ 0.82  
Granted during the year
     1,617,264        0.65  
Canceled during the year
     (105,921      0.50  
Vested during the year
     (1,505,454      0.74  
  
 
 
    
 
 
 
Unvested – December 31, 2020
     40,754      $ 0.95  
  
 
 
    
 
 
 
Schedule of Nonvested Restricted Stock Units Activity
A summary of RSU activity is as follows:​​​​​​​
    
Number of

Shares
    
Weighted Average

Grant Date Fair

Value (per share)
 
Unvested – December 31, 2020
     —        $ —  
Granted during the period
     2,616,948      10.01
Canceled during the period
     —          —    
Vested during the period
     (28,319      11.52
  
 
 
    
 
 
 
Unvested — June 30, 2021
     2,588,629    $ 9.99