Stock-based Compensation Expense

6 Months Ended

Jun. 30, 2022

Share-Based Payment Arrangement [Abstract]

Stock-based Compensation Expense

8. Stock-based Compensation Expense

On May 19, 2022, our stockholders approved the 2022 Equity Incentive Plan (the “2022 Plan”). The 2022 Plan provides for the grant of incentive stock options, non-statutory stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards and other stock-based awards. The number of shares of common stock reserved for issuance under the 2022 Plan is equal to the sum of: (i) 4,100,000 shares; and (ii) such additional number of shares (up to 14,231,243) as is equal to the sum of (x) the number of shares of common stock under the 2013 Stock Incentive Plan (the “2013 Plan”) that remained available for grant under the 2013 Plan immediately prior to May 19, 2022 and (y) the number of shares of common stock subject to awards granted under the 2013 Plan that are outstanding as of such date which awards expire, terminate or are otherwise surrendered, cancelled, forfeited or repurchased by us at their original issuance price pursuant to a contractual repurchase right.

The following table summarizes stock-based compensation expense included in operating expenses (in thousands):

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2022		2021		2022		2021
Cost of sales	$	55	$	36	$	110	$	80
Research and development		6,953		3,114		9,921		6,046
Selling, general and administrative		8,085		4,985		12,398		9,368
Total	$	15,093	$	8,135	$	22,429	$	15,494