Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Grants outside of 2000 Plan (Details)

Stockholders' Equity - Grants outside of 2000 Plan (Details)							3 Months Ended	12 Months Ended
	Oct. 21, 2016 USD ($)	Oct. 18, 2016 $ / shares shares	May 06, 2016 item $ / shares	Apr. 22, 2016 USD ($)	Apr. 19, 2016 $ / shares shares	Aug. 28, 2015 USD ($)	Mar. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2016 $ / shares shares
Stockholder Rights Plan
Preferred stock, par value (in dollars per share) \| $ / shares							$ 0.001	$ 0.001	$ 0.001
At-the-market Offering Program and Underwritten Offering of Common Stock
Number of common stock shares available to accredited investors		3,600,000
Share price of common stock sold (in dollars per share) \| $ / shares		$ 1.20
Net proceeds from sale of the common stock, after deducting fees and other offering expenses (in dollars) \| $	$ 6,800,000			$ 13,100,000			$ 300,000	$ 12,800,000
Number of common stock shares available in public offering					2,700,000
Number of warrants or shares of common stock to be sold to purchase common stock					2
Warrant Activity
Common stock sold (in shares)							400,000	7,300,000
Common stock commissions paid \| $							$ 8,800	$ 400,000
Common stock available for issuance \| $							$ 12,200,000	$ 12,200,000
Series A Warrants
At-the-market Offering Program and Underwritten Offering of Common Stock
Number of shares of common stock that could be purchased with warrants					4,100,000
Exercise price (in dollars per share) \| $ / shares		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
Warrant Activity
Balance, beginning of period (in shares)								0
Issuance of warrants (in shares)								10,407,500
Balance, end of period (in shares)							10,407,500	10,407,500	0
Series B Warrants
At-the-market Offering Program and Underwritten Offering of Common Stock
Number of shares of common stock that could be purchased with warrants					5,500,000
Exercise price (in dollars per share) \| $ / shares		1.20			$ 3.48
Exercise price pre-funded at closing (in dollars per share) \| $ / shares		1.19
Exercise price, payable upon exercise (in dollars per share) \| $ / shares		$ 0.01
Number of warrants or shares of common stock to be sold to purchase common stock					2
Number of shares of common stock purchased with each warrant					1
Length of time from exercise date until warrants expire					9 months
Warrant Activity
Balance, beginning of period (in shares)								0
Issuance of warrants (in shares)								8,215,000
Warrants exercised (in shares)								(8,215,000)
Balance, end of period (in shares)									0
Minimum \| Series B Warrants
At-the-market Offering Program and Underwritten Offering of Common Stock
Number of shares of common stock that could be purchased with warrants		2,700,000
Maximum
Warrant Activity
Aggregate offering price for at-the-market offering program \| $						$ 30,000,000
Maximum \| Series A Warrants
At-the-market Offering Program and Underwritten Offering of Common Stock
Number of shares of common stock that could be purchased with warrants		6,300,000
Stock options
Class of Stock [Line Items]
Options outstanding (in shares)							314,537	314,537	467,631
Options granted (in shares)								88,930
Portion vesting on first day of each month after one year from the issuance date (as a percent)								2.083%
Vesting period								4 years
Expiration Term								10 years
Stock options \| Non-qualified stock options
Class of Stock [Line Items]
Options outstanding (in shares)							88,930	88,930
Restricted stock units
Class of Stock [Line Items]
Restricted stock units outstanding (in shares)							14,820	14,820
Vesting period								4 years
Stock options and restricted stock units
Class of Stock [Line Items]
Portion vesting on first day of each month after one year from the issuance date (as a percent)								2.083%
Vesting period								4 years
Expiration Term								10 years
Series B Junior Participating Preferred Stock
Stockholder Rights Plan
Preferred share purchase rights period			30 days
Preferred share purchase right ratio			1
Preferred stock conversion basis			0.001
Preferred stock, par value (in dollars per share) \| $ / shares			$ 0.001
Purchase price (in dollars per share) \| $ / shares			$ 8.76
Period following public announcement of beneficial ownership acquired by various persons resulting in rights becoming exercisable			10 days
Period following commencement of tender offer or exchange offer that would result in acquisition of beneficial ownership various persons resulting in rights becoming exercisable			10 days
Preferred stock dividend minimum if declared \| $ / shares			$ 1.00
Preferred stock rights ratio over common stock			1,000
Number of votes per share \| item			1,000
Ratio of consideration received in event of conversion or exchange transaction			1,000
Series B Junior Participating Preferred Stock \| Minimum
Stockholder Rights Plan
Beneficial ownership of common stock (as a percent)			4.99%