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Stock Option Plan (Tables)
9 Months Ended
Sep. 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 
Granted229,850 $16.79 
Exercised(11,188)$7.13 
Forfeited(122,435)$14.49 
Expired(4,931)$21.50 
Outstanding, September 30, 2021
2,067,057 $12.20 8.14$6,956 
Vested and expected to vest, September 30, 2021
2,067,057 $12.20 8.14$6,956 
Options exercisable, September 30, 2021
979,111 $10.30 7.77$4,794 
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 granted422,150 $16.81 
Awards released— $— 
Awards canceled(19,050)$16.28 
Outstanding, September 30, 2021
403,100 $16.84 $5,482 
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 September 30,Nine Months Ended September 30,
 2021202020212020
Expected volatility
86%
52%
83%-86%
47%-52%
Risk-free interest rate
0.9%
0.4%
0.8%-1.1%
0.4%-1.7%
Dividend yield
Expected term (in years)
5.77
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 September 30,Nine Months Ended September 30,
 2021202020212020
Expected volatility45%83%
45%-60%
58%-83%
Risk-free interest rate0.1%0.1%0.1%
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 September 30,Nine Months Ended September 30,
 2021202020212020
Cost of revenue$64 $$136 $21 
Selling, general and administrative1,115 710 2,955 1,696 
Research and development175 80 460 160 
Total$1,354 $799 $3,551 $1,877