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Warrants and Derivative Liabilities (Tables)
3 Months Ended
Jun. 30, 2017
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 17
June 30,
2017
Risk-free interest rate
1.05%
Expected annual dividend yield
Expected volatility
78.25%
Term  (years)
0.26
Fair value
$—
Fiscal Year 16
March 31,
2017
 
December 31,
2016
 
September 30,
2016
 
June 30,
2016
 
March 31,
2016
Risk-free interest rate
0.91%
 
0.56%
 
0.59%
 
0.48%
 
0.66%
Expected annual dividend yield
 
 
 
 
Expected volatility
44.12%
 
58.04%
 
70.50%
 
76.30%
 
76.76%
Term  (years)
0.51
 
0.76
 
1.01
 
1.26
 
1.51
Fair value
$—
 
$0.1 million
 
$0.2 million
 
$0.4 million
 
$0.4 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 17
June 30,
2017
Risk-free interest rate
1.58%
Expected annual dividend yield
Expected volatility
67.76%
Term  (years)
2.97
Fair value
$0.1 million
Fiscal Year 16
March 31,
2017
 
December 31,
2016
 
September 30,
2016
 
June 30,
2016
 
March 31,
2016
Risk-free interest rate
1.55%
 
1.57%
 
0.97%
 
0.86%
 
1.08%
Expected annual dividend yield
 
 
 
 
Expected volatility
66.51%
 
67.28%
 
67.98%
 
68.34%
 
70.25%
Term  (years)
3.25
 
3.50
 
3.75
 
4.00
 
4.25
Fair value
$0.2 million
 
$0.2 million
 
$0.2 million
 
$0.3 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 17
June 30,
2017
Risk-free interest rate
1.44%
Expected annual dividend yield
Expected volatility
67.21%
Term  (years)
2.37
Fair value
$0.9 million
Fiscal Year 16
March 31,
2017
 
December 31,
2016
 
September 30,
2016
 
June 30,
2016
 
March 31,
2016
Risk-free interest rate
1.41%
 
1.43%
 
0.93%
 
0.77%
 
0.98%
Expected annual dividend yield
 
 
 
 
Expected volatility
66.53%
 
69.31%
 
68.96%
 
70.01%
 
69.88%
Term  (years)
2.62
 
2.87
 
3.12
 
3.37
 
3.62
Fair value
$1.8 million
 
$2.3 million
 
$2.3 million
 
$3.2 million
 
$2.6 million