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Stock Option Plan (Tables)
6 Months Ended
Jun. 30, 2022
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 (in thousands)
Outstanding, December 31, 20212,014,330 $12.10 7.87$5,428 
Granted63,000 $5.25 
Forfeited(102,110)$13.79 
Expired(25,846)$14.39 
Outstanding, June 30, 2022
1,949,374 $11.76 7.00$2,611 
Vested and expected to vest, June 30, 2022
1,949,374 $11.76 7.00$2,611 
Options exercisable, June 30, 2022
1,334,116 $10.76 6.55$2,365 
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 (in thousands)
Outstanding, December 31, 2021415,325 $16.54 $4,830 
Awards granted540,225 $8.66 
Awards released(90,821)$17.05 
Awards canceled(79,789)$11.96 
Outstanding, June 30, 2022
784,940 $11.53 $4,506 
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,
 2022202120222021
Expected volatility
54%
83%
54%
83%-84%
Risk-free interest rate
3.4%
1.1%
3.4%
0.8%-1.1%
Dividend yield
Expected term (in years)
5.50
5.50-6.08
5.50
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,
 2022202120222021
Expected volatility45%60%
45%
60%
Risk-free interest rate0.6%0.1%0.6%
0.1%
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 statements of operations is as follows (in thousands):
 
 Three Months Ended June 30,Six Months Ended June 30,
 2022202120222021
Costs of revenue$59 $61 $103 $72 
Selling, general and administrative1,203 1,049 2,321 1,840 
Research and development178 175 392 285 
Total$1,440 $1,285 $2,816 $2,197