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Stockholders' Equity (Tables)
9 Months Ended
Dec. 31, 2018
Class Of Stock [Line Items]  
Schedule of Stock-based Compensation Expense

Stock-based compensation expense for all stock-based awards consists of the following (in thousands):

 

 

 

Three Months Ended

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

Nine Months Ended

 

 

 

December 31, 2018

 

 

December 31, 2017

 

 

December 31, 2018

 

 

December 31, 2017

 

Research and development

 

$

249

 

 

$

210

 

 

$

679

 

 

$

925

 

General and administrative

 

$

1,109

 

 

$

1,040

 

 

$

3,232

 

 

$

4,675

 

Total

 

$

1,358

 

 

$

1,250

 

 

$

3,911

 

 

$

5,600

 

 

Fair Value of Employee Stock Options The fair value of stock options was estimated at the grant date using the following weighted average assumptions:

 

 

 

Three Months Ended

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

Nine Months Ended

 

 

 

December 31, 2018

 

 

December 31, 2017

 

 

December 31, 2018

 

 

December 31, 2017

 

Dividend yield

 

 

 

 

 

 

 

 

 

 

 

 

Volatility

 

 

73.07

%

 

 

80.71

%

 

 

72.99

%

 

 

76.86

%

Risk-free interest rate

 

 

2.79

%

 

 

2.15

%

 

 

2.75

%

 

 

1.81

%

Expected life of options

 

6 years

 

 

6 years

 

 

6 years

 

 

6 years

 

Weighted average grant

   date fair value

 

$

0.67

 

 

$

1.04

 

 

$

0.84

 

 

$

1.73

 

Fair Value of Employee Stock Purchase Plan The fair value of ESPP shares was estimated at the purchase period commencement date using the following assumptions:

 

 

 

Three Months Ended

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

Nine Months Ended

 

 

 

December 31, 2018

 

 

December 31, 2017

 

 

December 31, 2018

 

 

December 31, 2017

 

Dividend yield

 

 

 

 

 

 

 

 

 

 

 

 

Volatility

 

 

80.23

%

 

 

43.03

%

 

61.35-80.23%

 

 

43.03 - 74.70%

 

Risk-free interest rate

 

 

2.29

%

 

 

1.10

%

 

1.85-2.29%

 

 

0.79 - 1.10%

 

Expected term

 

6 months

 

 

6 months

 

 

6 months

 

 

6 months

 

Grant date fair value

 

$

0.45

 

 

$

0.52

 

 

$0.30 - $0.45

 

 

$0.52 - $1.04

 

Summary of Stock Option Activity

A summary of the Company’s stock option activity from March 31, 2018 to December 31, 2018 is as follows:

 

 

 

Options

Outstanding

 

 

Weighted

Average

Exercise Price

 

 

Aggregate

Intrinsic

Value

 

Outstanding at March 31, 2018

 

 

10,132,312

 

 

$

4.01

 

 

$

591,082

 

Options granted

 

 

8,024,194

 

 

$

1.29

 

 

$

 

Options cancelled / forfeited

 

 

(4,496,763

)

 

$

4.21

 

 

$

 

Options exercised

 

 

(622,192

)

 

$

0.08

 

 

$

561,591

 

Outstanding at December 31, 2018

 

 

13,037,551

 

 

$

2.45

 

 

$

 

Vested and Exercisable at December 31, 2018

 

 

4,481,218

 

 

$

4.06

 

 

$

 

Summary of Warrant Activity

The following table summarizes warrant activity for the nine months ended December 31, 2018:

 

 

 

Warrants

 

 

Weighted

Average

Exercise Price

 

Balance at March 31, 2018

 

 

220,000

 

 

$

7.19

 

Granted

 

 

 

 

$

 

Exercised

 

 

 

 

$

 

Cancelled

 

 

(75,000

)

 

$

7.36

 

Balance at December 31, 2018

 

 

145,000

 

 

$

7.11

 

Common Stock Reserved for Future Issuance

Common stock reserved for future issuance consisted of the following at December 31, 2018:

 

Common stock warrants outstanding

 

 

145,000

 

Common stock options outstanding and reserved under the 2012 Plan

 

 

9,974,645

 

Common stock reserved under the 2012 Plan

 

 

12,452,052

 

Common stock reserved under the 2016 Employee Stock Purchase Plan

 

 

1,230,735

 

Restricted stock units outstanding under the 2012 Plan

 

 

2,105,414

 

Common stock options outstanding and reserved under the Incentive

   Award Agreement

 

 

3,062,906

 

Restricted stock units outstanding under the Incentive Award Agreement

 

 

160,714

 

Performance-based restricted stock units outstanding under the Incentive Award

   Agreement

 

 

158,706

 

Total at December 31, 2018

 

 

29,290,172

 

Restricted stock units (RSUs) [Member]  
Class Of Stock [Line Items]  
Summary of Company's Restricted Stock Unit Activity and Performance Based Restricted Stock Unit Activity

A summary of the Company’s restricted stock unit (not including performance-based restricted stock units) activity from March 31, 2018 through December 31, 2018 is as follows:

 

 

Number of

Shares

 

 

Weighted

Average Price

 

Unvested at March 31, 2018

 

 

2,035,345

 

 

$

2.89

 

Granted

 

 

1,906,402

 

 

$

1.18

 

Vested

 

 

(595,163

)

 

$

2.48

 

Cancelled / forfeited

 

 

(1,080,456

)

 

$

2.35

 

Unvested at December 31, 2018

 

 

2,266,128

 

 

$

1.82

 

Performance-Based Restricted Stock Units [Member]  
Class Of Stock [Line Items]  
Summary of Company's Restricted Stock Unit Activity and Performance Based Restricted Stock Unit Activity

A summary of the Company’s performance-based restricted stock unit activity from March 31, 2018 through December 31, 2018 is as follows:

 

 

 

Number of

Shares

 

 

Weighted

Average Price

 

Unvested at March 31, 2018

 

 

200,470

 

 

$

1.88

 

Granted

 

 

 

 

$

 

Vested

 

 

(41,764

)

 

$

1.88

 

Cancelled / forfeited

 

 

 

 

$

 

Unvested at December 12, 2018

 

 

158,706

 

 

$

1.88

 

Impact of modification

 

 

 

 

$

(0.74

)

Unvested at December 31, 2018

 

 

158,706

 

 

$

1.04