Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Effective Income Tax Rate Reconciliation

The difference between income taxes expected at the U.S. federal statutory income tax rate of 21% and the reported income tax expense (benefit) are summarized as follows:

	December 31,
	2019			2018
Income tax at statutory rate	$	(2,703)		$	(2,138)
Valuation allowance	2,948			2,266
State income tax, net of federal benefit	(606)			(521)
Business tax credit net of reserves	—			(325)
Non-deductible expenses	365			341
Foreign income taxes at different rate	1			3
Income tax benefit	$	5		$	(374)
Effective tax rate	(0.04)		%	3.67		%

Provision Expense (Benefit) for Income Taxes

The provision expense (benefit) for income taxes consists of the following:

	Year Ended December 31,
	2019		2018
Current:
Federal	$	—	$	—
State	5		13
Foreign	—		—
Total current	5		13
Deferred:
Federal	—		(346)
State	—		(41)
Foreign	—		—
Total deferred	—		(387)
Total	$	5	$	(374)

Components of Net Deferred Income Taxes

The components of net deferred income taxes consist of the following:

	December 31,
	2019		2018
Deferred tax assets:
Net operating loss	$	26,285	$	24,280
Reserves and accruals	3,842		2,836
Tax credits	1,463		1,349
Gross deferred tax assets	31,590		28,465
Less valuation allowance	(31,349)		(28,401)
Total deferred tax assets	241		64
Deferred tax liabilities:
Amortization of acquired intangibles	(241)		(64)
Total deferred tax liabilities	(241)		(64)
Net deferred tax liabilities	$	—	$	—

Reconciliation of Unrecognized Tax Benefits

The following is a tabular reconciliation of the total amounts of unrecognized tax benefits:

	December 31,
	2019		2018
Unrecognized tax benefits, beginning of period	$	1,516	$	889
Tax positions taken in prior periods:
Gross increases	—		166
Gross decreases	—		—
Tax positions taken in current period:
Gross increases	15		461
Settlements	—		—
Lapse of statute of limitations	—		—
Unrecognized tax benefits, end of period	$	1,531	$	1,516