Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Schedule of Components of Loss Before Income Taxes

The components of the Company’s loss before income taxes are as follows:

	Year ended December 31,
	2020		2019
	(in thousands)
Domestic	$	(41,708)	$	(37,709)
Foreign	(1,989)		(694)
Loss before income taxes	$	(43,697)	$	(38,403)

Schedule of Components of Income Tax Expense

The components of deferred income taxes are as follows:

	Year ended December 31,
	2020		2019
	(in thousands)
Federal	$	9,855	$	8,523
State	2,711		1,569
Foreign	583		(200)
Total deferred income taxes	13,149		9,892
Change in deferred tax valuation allowance	(13,149)		(9,892)
Net deferred income tax	$	—	$	—

Schedule of Effective Income Tax Rate Reconciliation

Income tax expense differs from the amount computed by applying the statutory federal income tax rate due to the following:

	Year ended December 31,
	2020		2019
Tax at statutory federal rate	(21.0)	%	(21.0)	%
State tax, net of federal benefit	(6.2)	%	(4.1)	%
Tax credits	(0.7)	%	(0.7)	%
Change in deferred tax valuation allowance	30.1	%	25.8	%
Stock compensation	(1.2)	%	(1.5)	%
Foreign rate differences	(1.3)	%	0.5	%
Other	0.3	%	1.0	%
Total income tax expense	—	%	—	%

Schedule of Deferred Tax Assets

The tax effects of temporary differences and carryforwards that give rise to significant portions of the deferred tax assets are presented below:

	Year ended December 31,
	2020		2019
	(in thousands)
Net operating loss carryforwards	$	52,331	$	42,032
Research and development credits	3,160		2,428
Accruals and reserves	5,450		4,222
Stock compensation	2,395		1,512
Depreciation and amortization	117		110
Total deferred tax assets	63,453		50,304
Less: Valuation allowance	(63,453)		(50,304)
Total deferred tax asset, net of valuation allowance	$	—	$	—

Summary of Changes in Valuation Allowance

The following table summarizes changes in the valuation allowance for the years ended December 31, 2020 and 2019:

	Year ended December 31,
	2020		2019
	(in thousands)
Beginning balance	$	50,304	$	40,412
Additions during the period	13,149		9,892
Ending balance	$	63,453	$	50,304

Schedule of Uncertain Income Tax Positions

The changes in the Company’s uncertain income tax positions for the years ended December 31, 2020 and 2019 consisted of the following:

	Year ended December 31,
	2020		2019
	(in thousands)
Balance at beginning of the year	$	1,287	$	1,084
Increases related to current year's tax positions	226		203
Balance at end of the year	$	1,513	$	1,287