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Stock-Based Compensation
 12 Months Ended
Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
Share-Based Compensation Expense
The following table presents the details of the Company's share-based compensation expense (in thousands):
Year Ended December 31,
20252024
General and administrative$2,745 $3,304 
Research and development1,755 1,902 
Sales and marketing611 720 
Cost of sales665 787 
Total stock-based compensation$5,776 $6,713 
2016 Employee Incentive Plan
The Company’s board of directors adopted the 2016 Equity Incentive Plan (the 2016 Plan) on April 25, 2016, which was subsequently approved on September 20, 2016 by the Company’s stockholders. The 2016 Plan became effective on October 7, 2016, the date the Company’s S-8 registration statement relating to the 2016 Plan was declared effective by the SEC.
The 2016 Plan provides for the grant of incentive stock options, non-statutory stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, performance-based stock awards, and other forms of equity
compensation to employees, directors, and consultants. In addition, the 2016 Plan provides for the grant of performance cash awards to employees, directors, and consultants.
The maximum number of shares of common stock that may be issued under the 2016 Plan was initially 500,000 subject to an automatic increase on January 1 of each year, beginning on January 1, 2017, and continuing through and including January 1, 2026, by 3% of the total number of shares of capital stock outstanding on December 31 of the preceding calendar year, or a lesser number of shares determined by the Company’s board of directors. On May 20, 2021, the Company’s stockholders approved an amendment to the 2016 Plan to increase the total number of authorized shares of common stock available for grant thereunder by an additional 550,000 shares. At December 31, 2025, of the 2,899,603 shares of common stock reserved and available for grant under the 2016 Plan, 249,349 shares of common stock remain available for grant under the 2016 Plan. The Company authorized 661,790 shares during the year ended December 31, 2025.
2008 Employee Incentive Plan
The 2008 Equity Incentive Plan (the 2008 Plan) provided for the issuance of incentive stock options (ISO), nonqualified stock options, and other stock compensation awards.
Due to the adoption of the 2016 Plan, no further grants will be made under the 2008 Plan. However, any outstanding stock awards granted under the 2008 Plan will remain outstanding, subject to the terms of the Company’s 2008 Plan and the applicable stock award agreements, until such outstanding stock awards that are stock options are exercised or until they terminate or expire by their terms, or until such stock awards are fully settled, terminated, or forfeited. At December 31, 2025, 8,361 options under the 2008 Plan remained outstanding.
Summary of Stock Option Activity
The following table summarizes the stock option activity for all grants under the 2008 Plan and 2016 Plan:
Options Outstanding
Number of
Options		Weighted-
Average
Exercise
Price Per
Share		Weighted-
Average
Remaining
Contractual
Life (years)		Aggregate
Intrinsic
Value
(In thousands)
Balance—December 31, 20241,521,857$6.04 5.9$1,507 
Options granted
—
Options exercised(140,841)$4.76 $401 
Options cancelled/forfeited(16,014)$7.26 
Balance—December 31, 20251,365,002$6.16 4.9$4,303 
Options exercisable—December 31, 20251,347,618$6.13 4.9$4,281 
The total grant date fair value of options vested was $0.7 million and $1.2 million during the years ended December 31, 2025 and 2024, respectively.
No options were granted during the years ended December 31, 2025 and 2024.
As of December 31, 2025, there was $0.1 million of total unrecognized compensation expense related to unvested options which is expected to be recognized over a weighted-average period of 0.3 years. Stock-based compensation cost for options capitalized within inventory at December 31, 2025 and 2024 was not material.
2016 Employee Stock Purchase Plan
The Company’s board of directors adopted the 2016 Employee Stock Purchase Plan (the ESPP) on April 25, 2016, which was subsequently approved on September 20, 2016 by the Company’s stockholders. The Company had 1,141,546 shares available for issuance under the ESPP as of December 31, 2025. Employees purchased 110,850 shares for $0.5
million during the year ended December 31, 2025, and 69,166 shares for $0.4 million during the year ended December 31, 2024.
Restricted Stock Units
In September 2017, the Company’s board of directors authorized the issuance of restricted stock units (RSUs), under the 2016 Plan and adopted a form of Restricted Stock Unit Award Agreement, which is intended to serve as a standard form agreement for RSU grants issued to employees, executive officers, directors, and consultants. The fair value of the RSUs is recognized as expense ratably over the vesting period, as determined by the board of directors on the date of grant.
The following table summarizes RSU activity for the year ended December 31, 2025:
RSUs Outstanding
Number of
Restricted Stock
Units		Weighted-
Average
Grant Date
Fair Value Per
Share
Balance—December 31, 2024987,965$7.89 
Granted1,000,090$5.82 
Vested(666,409)$7.26 
Cancelled/forfeited(27,480)$6.89 
Balance—December 31, 20251,294,166$6.63 
The fair value of RSUs is determined on the date of grant based on the market price of the Company’s common stock on that date. As of December 31, 2025, there was $7.0 million of unrecognized stock-based compensation expense related to RSUs to be recognized over a weighted-average period of 2.6 years. Compensation cost capitalized within inventory was immaterial as of December 31, 2025 and 2024.