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Warrants and Derivative Liabilities (Tables)
3 Months Ended
Jun. 30, 2016
Exchanged Warrants  
Class Of Warrant Or Right [Line Items]  
Schedule of Assumptions Used to Calculate the Fair Value of Warrants
Following is a summary of the key assumptions used to calculate the fair value of the Exchanged Warrant:
Fiscal Year 16
June 30,
2016
Risk-free interest rate
0.48%
Expected annual dividend yield
Expected volatility
76.30%
Term  (years)
1.26
Fair value
$0.4 million
Fiscal Year 15
March 31,
2016
 
December 31,
2015
 
September 30,
2015
 
June 30,
2015
 
March 31,
2015
Risk-free interest rate
0.66%
 
0.96%
 
0.64%
 
0.74%
 
0.73%
Expected annual dividend yield
 
 
 
 
Expected volatility
76.76%
 
76.68%
 
73.39%
 
71.61%
 
70.42%
Term  (years)
1.51
 
1.76
 
2.01
 
2.26
 
2.51
Fair value
$0.4 million
 
$0.3 million
 
$0.1 million
 
$0.2 million
 
$0.3 million
Hercules Warrants  
Class Of Warrant Or Right [Line Items]  
Schedule of Assumptions Used to Calculate the Fair Value of Warrants
Following is a summary of the key assumptions used to calculate the fair value of the Hercules Warrant:
Fiscal Year 16
June 30,
2016
Risk-free interest rate
0.86%
Expected annual dividend yield
Expected volatility
68.34%
Term  (years)
4.00
Fair value
$0.3 million
Fiscal Year 15
March 31,
2016
 
December 31,
2015
 
September 30,
2015
 
June 30,
2015
 
March 31,
2015
Risk-free interest rate
1.08%
 
1.65%
 
1.31%
 
1.63%
 
1.41%
Expected annual dividend yield
 
 
 
 
Expected volatility
70.25%
 
73.57%
 
75.32%
 
72.57%
 
74.60%
Term  (years)
4.25
 
4.50
 
4.75
 
5.00
 
5.25
Fair value
$0.2 million
 
$0.2 million
 
$0.1 million
 
$0.2 million
 
$0.2 million
November 2014 Warrant  
Class Of Warrant Or Right [Line Items]  
Schedule of Assumptions Used to Calculate the Fair Value of Warrants
Following is a summary of the key assumptions used to calculate the fair value of the November 2014 Warrant:
Fiscal Year 16
June 30,
2016
Risk-free interest rate
0.77%
Expected annual dividend yield
Expected volatility
70.01%
Term  (years)
3.37
Fair value
$3.2 million
Fiscal Year 15
March 31,
2016
 
December 31,
2015
 
September 30,
2015
 
June 30,
2015
 
March 31,
2015
Risk-free interest rate
0.98%
 
1.51%
 
1.17%
 
1.44%
 
1.28%
Expected annual dividend yield
 
 
 
 
Expected volatility
69.88%
 
70.02%
 
73.02%
 
74.18%
 
75.96%
Term  (years)
3.62
 
3.87
 
4.12
 
4.37
 
4.62
Fair value
$2.6 million
 
$2.1 million
 
$1.3 million
 
$1.8 million
 
$2.5 million