Capital Stock (Tables)

12 Months Ended

Dec. 31, 2016

Stockholders Equity Note [Abstract]

Warrants to Purchase Shares of Common Stock Outstanding

The following table sets forth a summary of outstanding warrants to purchase shares of the Company’s common stock as of December 31, 2016.  

	Issue Date	Expiration Date	Outstanding		Exercise Price
TriplePoint Capital LLC	August 2010	August 2017		666	$	17.70
TriplePoint Capital LLC	October 2011	October 2018		523	$	17.70
TriplePoint Capital LLC	January 2012	October 2018		104	$	17.70
Genesis Select	June 2013	June 2018		100	$	24.45
2013 Warrants	December 2013	December 2018		55,774	$	49.80
2014 Warrants	August 2014	August 2019		19,462	$	36.20
Series A Warrants	February 2015	February 2020		11,417	$	5.80
Series C Warrants	May 2015	May 2020		21,500	$	27.80
Series D Warrants	December 2015	December 2020		930	$	2.00
Series E Warrants	December 2015	December 2016		-	$	-
Series F Warrants	April 2016	April 2021		280,787	$	5.80
Series G Warrants	April 2016	April 2017		-	$	-
Series H Warrants	April 2016	October 2016		-	$	-
Series I Warrants	September 2016	September 2021		712,503	$	11.00
Series J Warrants	September 2016	September 2017		-	$	-
Total				1,103,766