Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

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,
	2019			2018
	(in thousands)
Domestic	$	(37,709	)	$	(16,835	)
Foreign	(694		)	(618		)
Loss before income taxes	$	(38,403	)	$	(17,453	)

Schedule of Components of Income Tax Expense

The components of deferred income taxes are as follows:

	Year ended December 31,
	2019			2018
	(in thousands)
Federal	$	8,523		$	3,555
State	1,569			822
Foreign	(200		)	200
Total deferred income taxes	9,892			4,577
Change in deferred tax valuation allowance	(9,892		)	(4,577		)
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,
	2019		2018
Tax at statutory federal rate	(21.0	)%	(21.0	)%
State tax, net of federal benefit	(4.1	)%	(5.3	)%
Tax credits	(0.7	)%	(0.7	)%
Change in deferred tax valuation allowance	25.8	%	26.2	%
Other	—	%	0.8	%
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,
	2019			2018
	(in thousands)
Net operating loss carryforwards	$	42,032		$	35,067
Research and development credits	2,428			2,255
Accruals and reserves	4,222			2,059
Stock compensation	1,512			899
Depreciation and amortization	110			132
Total deferred tax assets	50,304			40,412
Less: Valuation allowance	(50,304		)	(40,412		)
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 year ended December 31, 2019 and 2018:

	Year ended December 31,
	2019		2018
	(in thousands)
Beginning balance	$	40,412	$	35,835
Additions during the period	9,892		4,577
Ending balance	$	50,304	$	40,412

Schedule of Uncertain Income Tax Positions

The changes in the Company’s uncertain income tax positions for the years ended December 31, 2019 and 2018 consisted of the following:

	Year ended December 31,
	2019		2018
	(in thousands)
Balance at beginning of the year	$	1,084	$	993
Increases related to current year's tax positions	203		91
Balance at end of the year	$	1,287	$	1,084