Fair Value of Financial Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Summary of financial assets and liabilities measured at fair value on a recurring basis

The following table presents information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy utilized to determine such fair values:

	Fair Value Measurements as of
	December 31, 2017
	Level 1		Level 2		Level 3		Total
Liabilities:
Warrant liability	$	—	$	—	$	4,021	$	4,021
	$	—	$	—	$	4,021	$	4,021

Summary of roll forward of aggregate fair values of the warrant liability, derivative liability and contingent equity liability

The following table provides a rollforward of the aggregate fair values of the Company’s warrant liability, derivative liability and contingent equity liability, for which fair value is determined by Level 3 inputs:

	Warrant Liability			Derivative Liability			Contingent Equity Liability
Balance at December 31, 2017	$	4,021		$	—		$	—
Change in fair value	1,182			—			—
Reclassification to equity	(5,203		)	—			—
Balance at June 30, 2018	$	—		$	—		$	—
Balance at December 31, 2016	$	780		$	512		$	18,938
Change in fair value	3,083			(512		)	13,082
Issuance of common shares in settlement of contingent equity liability	—			—			(32,020		)
Balance at June 30, 2017	$	3,863		$	—		$	—