Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Significant Accounting Policies [Abstract]

Antidilutive Securities Excluded from Computation of Diluted Weighted Shares Outstanding

	Year Ended
	December 31,
	2019		2018
Basic and diluted net loss per share calculation:
Net loss, basic	$	(19,479,000)	$	(16,702,000)
Change in fair value of derivative liabilities, net of interest		(938,000)		—
Net loss, diluted		(20,417,000)		(16,702,000)
Weighted average shares outstanding, basic		7,827,197		4,652,777
Net loss per share, basic	$	(2.49)	$	(3.59)
Weighted average shares outstanding, diluted		8,009,909		4,652,777
Net loss per share, diluted	$	(2.55)	$	(3.59)

The following outstanding securities at December 31, 2019 and 2018 have been excluded from the computation of diluted weighted average shares outstanding for the years ended December 31, 2019 and 2018, as they would have been anti-dilutive:

	Year Ended
	December 31,
	2019	2018
Options	1,275,380	136,463
Restricted stock awards	343,493	416,856
Warrants	1,854,007	—
Total	3,472,880	553,319

Useful Lives of Property and Equipment

Estimated useful lives for property and equipment are as follows:

	Estimated Useful Lives
Laboratory equipment	5 – 10 years
Office and computer equipment	3 – 5 years
Leasehold improvements	Shorter of lease term or useful life