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Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation Expense
Stock-based compensation expense is included in the unaudited condensed consolidated statements of operations as follows (in thousands):
 Three Months Ended June 30,Six Months Ended June 30,
 2024202320242023
Cost of product revenue$101 $83 $216 $212 
Research and development 641 806 1,461 1,528 
Selling, general and administrative3,940 1,827 6,176 3,785 
Total$4,682 $2,716 $7,853 $5,525 
Schedule of Stock-based Compensation Expense by Security Types
The following table presents total stock-based compensation expense by security type included in the unaudited condensed consolidated statements of operations (in thousands):
 Three Months Ended June 30,Six Months Ended June 30,
 2024202320242023
Stock options$2,117 $1,096 $3,631 $2,018 
RSUs and restricted stock awards (“RSAs”)
1,152 1,373 2,469 2,499 
Performance-contingent restricted stock units (“PSUs”)
— 279 247 1,116 
Performance based options (“PBOs”)
1,341 (32)1,357 (108)
ESPP72 — 149 — 
Total$4,682 $2,716 $7,853 $5,525