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EQUITY INCENTIVE PLANS​
 6 Months Ended
Jun. 30, 2026
Share-Based Payment Arrangement [Abstract]  
EQUITY INCENTIVE PLANS​ EQUITY INCENTIVE PLANS
Stock-Based Compensation Expense
Stock-based compensation expense for stock options, RSUs and our ESPP included in our condensed statements of operations and comprehensive loss was as follows:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)
2026202520262025
Selling, general and administrative$12,408 $9,273 $23,964 $17,757 
Research and development2,908 2,414 5,510 6,018 
Total$15,316 $11,687 $29,474 $23,775 
A summary of our total unrecognized stock-based compensation expense, net of estimated forfeitures, as of June 30, 2026 is as follows:
Unrecognized Compensation Expense
(in thousands)
Average Remaining Vesting Period
(in years)
Stock option grants$52,092 2.6
RSU grants$91,005 2.9
ESPP$129 0.2
Stock Options
A summary of our stock option activity and related information for the six months ended June 30, 2026 is as follows:
Number of Shares
(in thousands)
Weighted-Average Exercise Price
per Share
Outstanding as of December 31, 202528,977 $5.54 
Granted3,968 $7.29 
Exercised(1,890)$3.38 
Forfeited or cancelled(1,780)$8.12 
Outstanding as of June 30, 202629,275 $5.76 
Exercisable as of June 30, 202618,078 $5.44 
Restricted Stock Units
A summary of our RSU activity and related information for the six months ended June 30, 2026 is as follows:
Number of RSUs
(in thousands)
Weighted-Average Grant Date Fair Value
per Share
Unvested as of December 31, 202512,583 $5.71 
Granted6,858 $7.24 
Vested(2,769)$6.09 
Forfeited or cancelled(1,353)$6.32 
Unvested as of June 30, 202615,319 $6.27 
Employee Stock Purchase Plan
During the six months ended June 30, 2026, we issued approximately 0.1 million shares of our common stock under the ESPP. The shares were purchased by employees at an average purchase price of $5.44 per share, resulting in proceeds to us of approximately $0.7 million.
Issuance of Common Stock for Services
During the six months ended June 30, 2026, we issued approximately 33 thousand shares of our common stock to members of the board of directors who elected to receive stock in lieu of their cash fees under our Non-Employee Director Compensation Program.