Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule net deferred tax assets and liabilities

Net deferred tax assets and liabilities for the years ended December 31, 2019 and 2018 are as follows (in thousands):

	2019		2018
Net operating losses	$	66,405	$	62,800
Stock-based compensation	1,648		873
Interest expense	1,494		—
Accrued liabilities and reserves	744		218
Fixed assets	51		72
Lease liability	658		—
Other temporary differences	23		315
Prepaid expenses	(186)		(176)
Right-of-use asset	(710)		—
Valuation allowance	(70,127)		(64,102)
Net deferred tax asset	$	—	$	—

Schedule of reconciliation between the statutory federal income tax rate and the effective income tax rate

A reconciliation between the statutory federal income tax rate and the effective income tax rate for the years ended December 31, 2019 and 2018 is as follows:

	2019		2018
Tax at federal statutory rate	21.0	%	21.0	%
Stock-based compensation	(1.2)	%	(29.3)	%
Deferred revenue	—	%	(2.8)	%
Change in Foreign NOLS due to liquidation	—	%	(8.3)	%
Other	(0.2)	%	3.3	%
Change in federal valuation allowance	(19.6)	%	16.1	%
Change in federal NOLs due to 382 study results	—	%	—	%
Tax provision	—	%	—	%