Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Measurements

Schedule of financial assets and liabilities at fair value

	Level 1		Level 2		Level 3		Total
	(in thousands)
At March 31, 2017
Assets:
Cash and cash equivalents	$	2,065	$	—	$	—	$	2,065
Trade accounts receivable		445		—		—		445
Trade accounts receivable - related party		746		—		—		746
Short-term investments		281		—		—		281
	$	3,537	$	—	$	—	$	3,537
Liabilities:
Warrant liability - related party	$	—	$	—	$	1,025	$	1,025
Warrant liability		—		—		935		935
	$	—	$	—	$	1,960	$	1,960
At December 31, 2016
Assets:
Cash and cash equivalents	$	2,588	$	—	$	—	$	2,588
Trade accounts receivable		380		—		—		380
Trade accounts receivable - related party		643		—		—		643
Short-term investments		334		—		—		334
	$	3,945	$	—	$	—	$	3,945
Liabilities:
Warrant liability - related party	$	—	$	—	$	976	$	976
Warrant liability		—		—		922		922
	$	—	$	—	$	1,898	$	1,898

Schedule of significant inputs to the valuation model

	March 31,		December 31,
	2017		2016
Company's ending stock price	$	0.63	$	0.58
Company's stock volatility		110%		110%
Applicable risk free interest rate		1.39%		1.39%

Summary of change in fair value of the warrant liability

		Fair Value Measurements
		Using Significant Unobservable
		Inputs (Level 3)
	Warrant Liabilities
	(in thousands)
Ending balance at December 31, 2016	$	1,898
Change in estimated fair value		62
Ending balance at March 31, 2017	$	1,960