Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Financial Liabilities

The following table sets forth the fair value of the Company’s financial liabilities by level within the fair value hierarchy (in thousands): 

	At June 30, 2020
	Level 1		Level 2		Level 3		Total
2017 Placement Warrants Liability	$	—	$	—	$	1,573	$	1,573
2016 Placement Warrants Liability		—		—		499		499
Total	$	—	$	—	$	2,072	$	2,072

	December 31, 2019
	Level 1		Level 2		Level 3		Total
2017 Placement Warrants Liability	$	—	$	—	$	1,330	$	1,330
2016 Placement Warrants Liability		—		—		4,043		4,043
Total	$	—	$	—	$	5,373	$	5,373

Summary of Changes in Fair Value of Level 3 Financial Liabilities

The following table sets forth a summary of the changes in fair value of the Company’s Level 3 financial liabilities (in thousands):

	Six Months Ended June 30,
	2020			2019
Fair value, beginning of period	$	5,373		$	11,844
Change in fair value of Level 3 financial liabilities		(3,301	)		6,935
Fair value of 2016 Placement Warrants at exercise		—			(2,039	)
Fair value of 2017 Placement Warrants at exercise		—			(65	)
Fair value, end of period	$	2,072		$	16,675