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Stock Option Plan (Tables)
6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity Stock option activity under the Company's 2019 Plan is set forth below: 
Number of
Options
Weighted-
Average
Exercise Price
Weighted-
Average
Remaining
Contractual
Term (Years)
Aggregate
Intrinsic
Value
Outstanding, December 31, 20201,975,761 $11.81 8.71$6,750 
Granted214,850 $17.11 
Exercised(9,436)$8.41 
Forfeited(54,766)$12.12 
Expired(2,792)$26.27 
Outstanding, June 30, 2021
2,123,617 $12.33 7.96$8,932 
Vested and expected to vest, June 30, 2021
2,123,617 $12.33 7.96$8,932 
Options exercisable, June 30, 2021
812,611 $10.04 7.47$5,125 
Schedule of Restricted Stock Unit Activity
Restricted stock unit activity under the Company's 2019 Plan is set forth below:
Number of
Shares
Weighted-
Average
Grant Date Fair Value
Aggregate
Intrinsic
Value
Outstanding, December 31, 2020— $— $— 
Awards granted389,700 $17.19 
Awards released— $— 
Awards canceled(14,175)$16.29 
Outstanding, June 30, 2021
375,525 $17.22 $5,629 
Schedule of Fair Value Assumptions, Stock Options
The fair value of employee stock options was estimated using the following assumptions to determine the fair value of stock options granted:
 
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Expected volatility
83%
51%
83%-84%
47%-51%
Risk-free interest rate
1.1%
0.4%
0.8%-1.1%
0.4%-1.7%
Dividend yield
Expected term (in years)
5.50-6.08
5.50-6.08
5.50-6.08
5.50-6.08
Schedule of Fair Value Assumptions, Employee Stock Purchase Plan The following assumptions were used to calculate the stock-based compensation for each stock purchase right granted under the ESPP:
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Expected volatility60%58%60%58%
Risk-free interest rate0.1%1.1%0.1%1.1%
Dividend yield
Expected term (in years)0.500.500.500.50
Schedule of Non-cash Stock-based Compensation Expense
Total non-cash stock-based compensation expense recorded related to options granted, restricted stock units granted and stock purchase rights granted under the ESPP in the condensed statement of operations is as follows (in thousands):
 
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Cost of revenue$61 $$72 $12 
Selling, general and administrative1,049 564 1,840 986 
Research and development175 77 285 80 
Total$1,285 $647 $2,197 $1,078