Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Taxes

Schedule of reconciliation of statutory federal income tax rate

	Year Ended December 31,
	2019		2018
Tax at statutory federal rate	(21.0)	%	(21.0)	%
State taxes, net of federal benefit	(0.8)		(1.7)
Stock-based compensation	2.0		1.5
Nondeductible executive compensation	—		0.9
Change in valuation allowance	18.9		20.6
Other	0.9		(0.3)
Provision for income taxes	0.0	%	0.0	%

Schedule of tax effects of temporary differences and carryforwards

The tax effects of temporary differences and carryforwards that give rise to significant portions of the deferred tax assets are as follows (in thousands):

	December 31,
	2019		2018
Deferred tax assets:
Net operating loss carryforwards	$	29,684	$	25,359
Inventory		874		1,442
Accruals		430		760
Depreciation and amortization		143		88
Limitation on business interest		186		96
Stock-based compensation		546		1,416
Right of use liability		776		—
Gross deferred tax assets		32,639		29,161
Valuation allowance		(31,840)		(29,073)
Deferred tax assets		799		88
Deferred tax liabilities:
Right of use asset		(710)		—
Other		(89)		(88)
Deferred tax liabilities		(799)		(88)
Net deferred tax assets	$	—	$	—