Supplemental Balance Sheet Information

12 Months Ended

Dec. 31, 2021

Balance Sheet Related Disclosures [Abstract]

5. Supplemental Balance Sheet Information

Prepaid expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following:

	December 31,
	2021		2020
Tax incentive refund	$	2,697	$	2,558
Prepaid research and development expenses		4,496		3,145
Prepaid insurance		112		973
Prepaid compensation benefits		575		609
Interest income receivable		—		4
Other current assets		1,698		271
Prepaid expenses and other current assets	$	9,578	$	7,560

Property and equipment, net

Property and equipment, net consisted of the following:

	December 31,
	2021			2020
Laboratory and office equipment	$	6,162		$	3,965
Leasehold improvements		1,635			1,377
Computer equipment		149			143
		7,946			5,485
Less: Accumulated depreciation and amortization		(3,820	)		(2,421	)
Property and equipment, net	$	4,126		$	3,064

Depreciation and amortization expense for the years ended December 31, 2021 and 2020 was $1,399 and $1,207, respectively.

Restricted Cash

As of December 31, 2021 and 2020, the Company had restricted cash as presented in the table below, which consists of cash used to secure letters of credit for the benefit of the landlord in connection with the Company’s lease agreements. The cash will be restricted until the termination or modification of the lease arrangement.

	December 31,
	2021		2020
Restricted cash	$	492	$	492

Accrued Expenses

Accrued expenses consisted of the following:

	December 31,
	2021		2020
Compensation and benefit costs	$	5,579	$	6,402
Research and development expenses		8,882		5,847
Consulting and professional fees		999		1,096
Other liabilities		178		348
	$	15,638	$	13,693