Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Deferred Income Taxes

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company and its subsidiary deferred tax assets are as follows:

	December 31,
	2019			2018			2017
In respect of:
Net operating loss carryforward	$	33,817		$	16,943		$	5,844
Deferred rent		—			61			46
Research and development expenses		4,591			3,891			2,887
Stock-based compensation		6,543			4,769			897
Issuance costs		2,063			1,367			1,261
In-process research and development		2,749			629			761
Right of use asset		(800	)		—			—
Lease Liability		896			—			—
Accrued expenses		762			598			5
Depreciation of fixed assets		(90	)		(93	)		—
Other		62			84			24
Less—valuation allowance		(50,593	)		(28,249	)		(11,725	)
Net deferred tax assets	$	—		$	—		$	—

Schedule of Change in Valuation Allowance

The change in valuation allowance for the years ended December 31, 2019, 2018 and 2017 were as follows:

	2019			2018			2017
Balance at the beginning of the year	$	(28,249	)	$	(11,725	)	$	(4,158	)
Changes during the year		(22,344	)		(16,524	)		(7,567	)
Balance at the end of the year	$	(50,593	)	$	(28,249	)	$	(11,725	)