Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2019

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 September 30, 2019
	Level 1		Level 2		Level 3		Total
2017 Placement Warrants Liability	$	—	$	—	$	2,408	$	2,408
2016 Placement Warrants Liability		—		—		786		786
Total	$	—	$	—	$	3,194	$	3,194

	At December 31, 2018
	Level 1		Level 2		Level 3		Total
2017 Placement Warrants Liability	$	—	$	—	$	7,115	$	7,115
2016 Placement Warrants Liability		—		—		4,729		4,729
Total	$	—	$	—	$	11,844	$	11,844

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):

	Nine Months Ended September 30,
	2019			2018
Fair value, beginning of period	$	11,844		$	22,420
Change in fair value of Level 3 financial liabilities		(4,674	)		(116	)
Fair value of 2016 Placement Warrants at exercise		(3,458	)		(342	)
Fair value of 2017 Placement Warrants at exercise		(518	)		—
Fair value, end of period	$	3,194		$	21,962