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Stock-Based Compensation
6 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-Based Compensation
The Company accounts for its stock-based compensation at fair value. The following table summarizes stock-based compensation expense by financial statement line item for the three and six months ended September 30, 2018 and 2017 (in thousands):
 
Three months ended September 30,
 
Six months ended September 30,
 
2018
 
2017
 
2018
 
2017
Cost of revenues
$
50

 
$
23

 
$
90

 
$
59

Research and development
70

 
61

 
121

 
110

Selling, general and administrative
705

 
394

 
1,399

 
1,063

Total
$
825

 
$
478

 
$
1,610

 
$
1,232


The Company issued 37,075 shares of immediately vested common stock and 413,000 shares of restricted stock awards during the six months ended September 30, 2018, and issued 37,140 shares of immediately vested common stock and 795,500 shares of restricted stock awards during the six months ended September 30, 2017.  These restricted stock awards generally vest over 2-3 years.  Awards for restricted stock include both time-based and performance-based awards.  For options and restricted stock awards that vest upon the passage of time, expense is being recorded over the vesting period.  Performance-based awards are expensed over the requisite service period based on probability of achievement. In addition, the Company issued 16,667 restricted stock units under the 2007 Stock Incentive Plan during the six months ended September 30, 2017, each of which represents the right to receive one share of common stock in connection with a severance agreement entered into with one of the Company's former executive officers. These restricted stock units vested and were settled in shares of common stock on the eighth day after receipt of an irrevocable release.
The estimated fair value of the Company’s stock-based awards, less expected annual forfeitures, is amortized over the awards’ service period. The total unrecognized compensation cost for unvested outstanding stock options was $0.1 million at September 30, 2018. This expense will be recognized over a weighted average expense period of approximately 0.5 years. The total unrecognized compensation cost for unvested outstanding restricted stock was $3.6 million at September 30, 2018. This expense will be recognized over a weighted-average expense period of approximately 1.9 years.
The Company did not grant any stock options during the three and six months ended September 30, 2018 or 2017.