Quarterly report pursuant to Section 13 or 15(d)

Offerings of Common Stock and Warrants and At-the-Market Offering Program (Details)

Offerings of Common Stock and Warrants and At-the-Market Offering Program (Details) - USD ($)							3 Months Ended		24 Months Ended
	Jun. 30, 2017	Oct. 21, 2016	Oct. 18, 2016	Apr. 22, 2016	Apr. 19, 2016	Aug. 28, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017
Number of common stock shares available to accredited investors			3,600,000
Share price of common stock sold (in dollars per share)			$ 1.20
Net proceeds from offering of common stock and warrants		$ 6,800,000		$ 13,100,000			$ 2,520,000	$ 13,128,000
Number of common stock shares available in public offering					2,700,000
Beneficial ownership of common stock resulting from purchase of stock in public offering (as a percent)					4.99%
Number of warrants or shares of common stock to be sold to purchase common stock					2
Aggregate offering price for at-the-market offering program	$ 13,700,000
Common stock sold (in shares)							3,500,000		10,700,000
Net proceeds from sale of the common stock, after deducting fees and other offering expenses (in dollars)							$ 2,500,000		$ 12,800,000
Common stock commissions paid							$ 37,700		$ 400,000
Maximum
Aggregate offering price for at-the-market offering program						$ 30,000,000
Series A Warrants
Number of shares of common stock that could be purchased with warrants					4,100,000
Exercise price (in dollars per share)			$ 1.34		$ 3.50
Number of warrants or shares of common stock to be sold to purchase common stock					1
Number of shares of common stock purchased with each warrant					1
Length of time from issue date until warrants are exercisable					6 months
Length of time from exercise date until warrants expire					5 years
Outstanding warrants (in shares)	10,407,500						10,407,500		10,407,500
Series A Warrants \| Maximum
Number of shares of common stock that could be purchased with warrants			6,300,000
Series B Warrants
Number of shares of common stock that could be purchased with warrants			2,700,000
Exercise price (in dollars per share)			$ 1.20		$ 3.48
Exercise price pre-funded at closing (in dollars per share)			1.19
Exercise price, payable upon exercise (in dollars per share)			$ 0.01
Number of warrants or shares of common stock to be sold to purchase common stock					2
Length of time from exercise date until warrants expire					9 months
Outstanding warrants (in shares)	0						0		0
Series B Warrants \| Maximum
Number of shares of common stock that could be purchased with warrants					5,500,000