Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The Company’s liabilities measured at fair value on a recurring basis and the fair value hierarchy utilized to determine such fair values is as follows at March 31, 2018 and December 31, 2017 (in thousands):



			Fair Value Measurements Using
	Total Fair Value at March 31, 2018		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative warrant liability - ESW warrant	$	1,888	$	—	$	—	$	1,888
Derivative warrant liability - Hale warrant	720		—		—		720
Derivative warrant liabilities	$	2,608	$	—	$	—	$	2,608



			Fair Value Measurements Using
	Total Fair Value at December 31, 2017		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Liabilities:
Derivative warrant liability - Hale warrant	$	819	$	—	$	—	$	819

Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

The following table represents a rollforward of the fair value of the Level 3 instrument (significant unobservable inputs):



Balance at December 31, 2017	$	819
Addition of warrant liability	2,176
Change in fair value	(387		)
Balance at March 31, 2018	$	2,608