Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Measurements

Schedule of financial assets and liabilities at fair value

	Level 1		Level 2		Level 3		Total
	(in thousands)
At September 30, 2017
Assets:
Cash and cash equivalents	$	4,966	$	—	$	—	$	4,966
Trade accounts receivable		387		—		—		387
Trade accounts receivable - related party		4		—		—		4
Short-term investments		242		—		—		242
	$	5,599	$	—	$	—	$	5,599
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

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