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Stock Option Plan (Tables)
6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Restricted Stock Unit Activity
RSU activity under the Company's 2019 Plan is set forth below:
Number of
Shares
Weighted-
Average
Grant Date Fair Value
Outstanding, December 31, 20231,387,459 $4.24 
Awards granted920,175 $1.89 
Awards released(280,054)$5.94 
Awards canceled(348,111)$4.33 
Outstanding, June 30, 2024
1,679,469 $2.65 
Schedule of Stock Option Activity
Stock option activity under the 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, 2023986,819 $11.87 6.44$228 
Granted55,500 $1.99 
Exercised(962)$0.26 
Forfeited(7,695)$16.35 
Expired(216,616)$14.96 
Outstanding, June 30, 2024
817,046 $10.36 6.27$202 
Vested and expected to vest, June 30, 2024
817,046 $10.36 6.27$202 
Options exercisable, June 30, 2024
786,623 $10.59 6.16$202 
Schedule of Non-Cash Stock-Based Compensation Expense
Total non-cash stock-based compensation expense recorded related to options granted, RSUs 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,
 2024202320242023
Costs of revenue$39 $63 $56 $116 
Selling, general and administrative465 874 944 1,705 
Research and development56 41 113 143 
Total$560 $978 $1,113 $1,964