Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Income Tax Disclosure [Abstract]

Summary of Company's Loss Before Income Taxes

The components of the Company’s loss before income taxes are as follows (in thousands):

	Years ended December 31,
	2021			2020
United States	$	(63,661	)	$	(36,004	)
International		143			176
	$	(63,518	)	$	(35,828	)

Summary of Provision for Income Taxes

The components of the provision for income taxes are as follows (in thousands):

	Years ended December 31,
	2021		2020
Current tax expense:
Federal	$	—	$	—
State		2		2
International		24		5
Total provision for income taxes	$	26	$	7

Summary of Provision for Income Taxes Differ from the Amounts Computed by Applying the U.S. Federal Income Tax Rate

The provision for income taxes differ from the amounts computed by applying the U.S. federal income tax rate to income loss before income taxes for the following reasons:

	Years ended December 31,
	2021			2020
Federal tax at statutory rate		21.00	%		21.00	%
State, net of federal benefit		—			—
Permanent differences		(0.39	)		1.53
Stock-based compensation		(3.36	)		(1.62	)
Uncertain tax positions		(0.81	)		(1.03	)
General business credits		1.15			1.44
Valuation allowance		(10.53	)		(17.97	)
Disqualified interest on debt		(7.10	)		(3.37	)
Effective tax rate		(0.04	)%		(0.02	)%

Summary of Deferred Tax Assets (Liabilities)

Significant components of deferred tax assets (liabilities) are as follows (in thousands):

	Years ended December 31,
	2021			2020
Net operating loss carryforwards	$	53,359		$	45,461
Tax credit carry forwards		5,941			5,117
Accruals and reserves		3,222			3,631
Stock-based compensation		2,197			1,491
Gross deferred tax assets		64,719			55,700
Valuation allowance		(64,385	)		(55,232	)
Net deferred tax assets		334			468
Depreciation and amortization		(334	)		(468	)
Gross deferred tax liabilities		(334	)		(468	)
Total net deferred tax assets (liabilities)	$	—		$	—

Summary of Reconciliation of the Amount off Unrecognized Tax Benefits

A reconciliation of the amount of unrecognized tax benefits is as follows (in thousands):

	Years ended December 31,
	2021		2020
Beginning balances	$	3,607	$	3,197
Increases (decreases) related to prior year tax positions		—		(7	)
Increases related to current year tax positions		571		417
Balance at December 31	$	4,178	$	3,607