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			6 Months Ended		46 Months Ended
	Sep. 04, 2019	Sep. 04, 2019	Feb. 04, 2019	Apr. 13, 2018	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Mar. 31, 2019	Jun. 07, 2018	Aug. 28, 2015
Offerings of Common Stock and Warrants and At-the-Market Offering Program
Common stock sold (in shares)				380,625
Initial exercise price (in dollars per share)					$ 6.1200			$ 6.1200
Common stock, par value (in dollars per share)					0.001			$ 0.001			$ 0.001
Warrants, aggregate shares	440,000	440,000
Net proceeds from offering of common stock and warrants	$ 4,700,000							$ 6,041,000	$ 8,083,000
Exercise price of common stock (in dollars per share)					$ 5.70			$ 5.70
Issuance of warrants (in shares)								765,000
Aggregate offering price of common stock					$ 4,815,000	$ 1,222,000	$ 3,109,000
Aggregate registered direct offering (in shares)		580,000
Aggregate registered direct offering par value (in dollars per share)	$ 0.001	$ 0.001
Negotiated purchase price of common stock	5.00	5.00
Negotiated purchase price of pre-funded warrant	$ 5.0000	$ 5.0000
Proceeds from issuance of warrants		$ 5,100,000
Common warrants period								5 years
Percentage of common stock								75.00%
Deemed dividend								$ 75,000
June 2018 Sales Agreement
Offerings of Common Stock and Warrants and At-the-Market Offering Program
Aggregate offering price for at-the-market offering program					$ 16,200,000			$ 16,200,000
Common stock sold (in shares)					36,000			200,000
Net proceeds from sale of the common stock, after deducting fees and other offering expenses (in dollars)					$ 300,000			$ 1,500,000
Common stock commissions paid					$ 10,800			$ 100,000
June 2018 Sales Agreement \| Maximum
Offerings of Common Stock and Warrants and At-the-Market Offering Program
Aggregate offering price for at-the-market offering program												$ 25,000,000
August 2015 Sales Agreement
Offerings of Common Stock and Warrants and At-the-Market Offering Program
Common stock sold (in shares)									300,000	2,600,000
Net proceeds from sale of the common stock, after deducting fees and other offering expenses (in dollars)									$ 4,000,000	$ 28,600,000
Common stock commissions paid									$ 100,000	$ 800,000
August 2015 Sales Agreement \| Maximum
Offerings of Common Stock and Warrants and At-the-Market Offering Program
Aggregate offering price for at-the-market offering program													$ 30,000,000
Series A Warrants
Offerings of Common Stock and Warrants and At-the-Market Offering Program
Warrants exercised (in shares)				576,000
Exercise price (in dollars per share)				$ 6.00
Outstanding warrants (in shares)					271,875			271,875
Series A Warrants, Exercise Price 2.55
Offerings of Common Stock and Warrants and At-the-Market Offering Program
Exercise price (in dollars per share)					$ 25.50			$ 25.50
Issued warrants (in shares)								217,875
Series A Warrants, Exercise Price 1.34
Offerings of Common Stock and Warrants and At-the-Market Offering Program
Initial exercise price (in dollars per share)					$ 13.40			$ 13.40
Issued warrants (in shares)								54,000
Series B Warrants
Offerings of Common Stock and Warrants and At-the-Market Offering Program
Outstanding warrants (in shares)					0			0
Common Stock Warrants
Offerings of Common Stock and Warrants and At-the-Market Offering Program
Exercise price (in dollars per share)			$ 8.86
Issued warrants (in shares)					29,646
Value of warrants					$ 2,300,000			$ 2,300,000
Warrants, aggregate shares			404,634
Proceeds from issuance of warrants			$ 150,000
Deemed dividend					$ 74,989,000