Annual report pursuant to Section 13 and 15(d)

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

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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%