Accrued Expenses (Tables)

9 Months Ended

Sep. 30, 2021

Payables and Accruals [Abstract]

Schedule of Accrued Liabilities

Accrued expenses consists of the following:

	September 30, 2021		December 31, 2020
Unvested early exercised stock options	$	16,187	$	8
Payroll related costs	11,675		7,895
Optical laboratory and inventory costs	9,874		1,032
Marketing expenses	6,070		9,585
Charitable contribution	4,738		5,182
Other accrued expenses	15,112		10,568
Total accrued expenses	$	63,656	$	34,270

During the nine months ended September 30, 2021, certain executives repaid related party loans used to exercise stock options. At September 30, 2021, a total of $16.2 million of the amount repaid related to unvested early-exercised stock options is included in accrued expenses.