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STOCK-BASED COMPENSATION AND STOCKHOLDERS' EQUITY
 3 Months Ended
Jun. 30, 2022
Equity [Abstract]  
STOCK-BASED COMPENSATION AND STOCKHOLDERS' EQUITY STOCK-BASED COMPENSATION AND STOCKHOLDERS' EQUITY
2012 Equity Incentive Plan
In June 2012, the Company's board of directors approved the 2012 Equity Incentive Plan (the "2012 Plan"). The Company's stockholders subsequently adopted the 2012 Plan in July 2012, which became effective in August 2012. The Company reserved 4.1 million shares of the Company's common stock for issuance under this plan. In August 2014, 2016, 2018 and 2019, the 2012 Plan was amended to allow for an additional 6.8 million shares, 4.5 million shares, 16.3 million shares, and 12.0 million shares reserved for issuance, respectively. The 2012 Plan provided for granting incentive stock options to employees and non-statutory stock options to employees, directors or consultants, and granting of stock appreciation rights, restricted stock, restricted stock units and performance units, qualified performance-based awards, and stock grants. The stock option price of incentive stock options granted could not be less than the fair market value on the effective date of the grant. Options, restricted stock, and restricted stock units generally vest over three or four years and expire ten years after grant. The 2012 Plan expired in June 2022.  
2017 New Employee Inducement Incentive Plan
For details on the 2017 New Employee Inducement Incentive Plan ("2017 Plan"), please refer to the Form 10-K. No grants were made under the 2017 Plan during the three months ended June 30, 2022. As of June 30, 2022, 1.8 million shares remained available for future grants under the 2017 Plan.
Stock-Based Compensation
The following table presents stock-based compensation expense (dollars in thousands):
 Three Months Ended June 30,
 20222021
Cost of service revenue$2,664 $1,968 
Cost of other revenue1,111 1,071 
Research and development8,044 8,698 
Sales and marketing8,107 14,326 
General and administrative7,888 10,524 
Total$27,814 $36,587 
Stock Options
The following table presents the stock option activity (shares in thousands):
Number of
Shares		Weighted Average Exercise Price Per Share
Outstanding at March 31, 2022867 $10.67 
Exercised(11)5.87 
Canceled/Forfeited(2)22.25 
Outstanding at June 30, 2022854 $10.71 
Vested and expected to vest June 30, 2022854 $10.71 
Exercisable at June 30, 2022852 $10.69 
The total intrinsic value of options exercised in the three months ended June 30, 2022 and 2021 was $40.0 thousand and $9.1 million respectively.
As of June 30, 2022, there was $14.0 thousand of total unrecognized compensation cost related to stock options, which is expected to be recognized over a weighted average period of approximately 0.3 years.
The Company did not grant any stock options during the three months ended June 30, 2022 and 2021.
The fair value of each of the Company's option grants has been estimated on the date of grant using the Black-Scholes pricing model. No option grants were made in the three months ended June 30, 2022 and 2021.
Stock Purchase Rights
There were no activities related to stock purchase rights during the three months ended June 30, 2022 and 2021.
As of June 30, 2022, there was no unrecognized compensation cost related to stock purchase rights.
Restricted Stock Units
The following table presents the RSU activity (shares in thousands):
Number of
Shares		Weighted
Average Grant
Date Fair Value		Weighted Average
Remaining Contractual
Term (in Years)
Balance at March 31, 20229,375 $20.41 2.11
Granted8,528 6.36 
Vested and released(1,657)21.00 
Forfeited(780)17.94 
Balance at June 30, 202215,466 $12.72 1.27
As of June 30, 2022, there was $130.7 million of total unrecognized compensation cost related to RSUs.

Performance Stock Units
PSUs are issued to a group of executives with vesting that is contingent on both market performance and continued service. The PSUs generally vest over periods ranging from one to three years based on Total Shareholder Return ("TSR"), as measured relative to specified market indices during the period from grant date through vesting date. A 2x multiplier will be applied for each percentage point of positive or negative relative TSR, such that the number of shares of common stock earned will increase or decrease by 2% of the target number of shares, subject to a maximum of 200% of the target number of shares. In the event that the Company’s relative TSR performance is less than negative 30%, relative to the specified index, no shares will be earned for the applicable performance period. All PSU awards vest at the end of the respective performance periods, for those executives with continued service.

The following table presents the PSU activity (shares in thousands):
Number of
Shares		Weighted
Average Grant
Date Fair Value		Weighted Average
Remaining Contractual
Term (in Years)
Balance at March 31, 20221,026 $35.36 0.89
Granted720 7.71 
Granted for performance achievement1
— — 
Vested and released(128)25.65 
Forfeited(354)37.65 
Balance at June 30, 20221,264 $19.96 1.86
1 Represents additional PSUs awarded as a result of the achievement of performance goals above the performance targets established at grant.
As of June 30, 2022, there was $32.1 million of total unrecognized compensation cost related to PSUs.
Employee Stock Purchase Plan ("ESPP")
As of June 30, 2022, there was approximately $1.7 million of unrecognized compensation cost related to employee stock purchases. This cost is expected to be recognized over a weighted average period of 0.3 years. As of June 30, 2022, a total of 1.0 million shares were available for issuance under the ESPP.
Stock Repurchases
There were no stock repurchases during the three months ended June 30, 2022 and 2021.