During the three months ended July 29, 2017, the Company also granted awards under the Restated 2006 Plan to key employees (“Fiscal 2018 LTIP”). Awards under the Fiscal 2018 LTIP consist of: (i) time-based restricted stock awards, which vest in equal tranches in July 2018, July 2019 and July 2020, and (ii) PRSUs, which vest based on the Company’s achievement of revenue and operating income targets for the three-year period ending April 30, 2020. At the award date, target achievement levels for each of the financial performance metrics were established for the PRSUs, at which levels the PRSUs would vest at 100% for each such metric. Threshold achievement levels for which the PRSUs would vest at 50% for each such metric and maximum achievement levels for which such awards would vest at 200% for each such metric were also established. The actual payout for the PRSUs at the end of the performance period will be calculated based upon the Company’s achievement of the established revenue and operating income targets for the performance period. Settlement of the PRSUs will be made in fully-vested shares of common stock. For the three and six months ended October 26, 2019, the Company reversed $46,000 and $39,000 of compensation expense related to the Fiscal 2018 LTIP, respectively. For the three and six months ended October 27, 2018, the Company recorded $113,000 and $334,000 of compensation expense related to the Fiscal 2018 LTIP, respectively. At October 26, 2019, the maximum compensation expense that may be recorded for the performance-based portion of the Fiscal 2018 LTIP is $1,850,000.
During the three months ended July 29, 2017, the Company also granted awards under the Restated 2006 Plan to key employees (“Fiscal 2017 LTIP”). Awards under the Fiscal 2017 LTIP consist of: (i) time-based restricted stock awards, which vested in equal tranches in July 2017, July 2018 and July 2019, and (ii) PRSUs, which vested based on the Company’s achievement of revenue and operating income targets for the three-year period ending April 30, 2019. During the three months ended July 27, 2019, the Company issued a total of 14,814 fully-vested shares of common stock to settle the PRSUs in the Fiscal 2017 LTIP. NaN compensation expense was recorded during the three and six months ended October 26, 2019 for the Fiscal 2017 LTIP.
At October 26, 2019 and April 30, 2019, the Company recorded cumulative stock-based compensation expense from the Fiscal 2020 LTIP, Fiscal 2019 LTIP and Fiscal 2018 LTIP of $1,736,000 and $1,429,000, respectively. At each reporting period, the Company reassesses the probability of achieving the performance targets for the PRSUs. The estimation of whether the performance targets will be achieved requires judgment, and to the extent actual results or updated estimates differ from the Company’s current estimates, the cumulative effect on current and prior periods of those changes will be recorded in the period estimates are revised.
14. Income Taxes
For the three and six months ended October 26, 2019, the Company recorded a provision for income taxes of $1,108,000 and $3,241,000, respectively, yielding an effective tax rate of 11.7% and 10.8%, respectively. For the three and six months ended October 27, 2018, the Company recorded a provision for income taxes of $1,211,000 and $3,778,000, respectively, yielding effective tax rates of 13.5% and 11.6%, respectively. The variance from statutory rates for the three and six months ended October 26, 2019 was primarily due to federal R&D credits, foreign derived intangible income deduction and the recording of discrete excess tax benefits resulting from the vesting of restricted stock awards and exercises of stock options. The variance from statutory rates for the three and six months ended October 27, 2018 was primarily due to federal R&D credits and the recording of discrete excess tax benefits resulting from the vesting of restricted stock awards and exercises of stock options.
15. Share Repurchase
In September 2015, the Company’s Board of Directors authorized a program to repurchase up to $25,000,000 of the Company’s common stock with no specified termination date for the program. NaN shares were repurchased under the program during the three and six months ended October 26, 2019 or October 27, 2018. As of October 26, 2019 and April 30, 2019, approximately $21,200,000 million remained authorized for future repurchases under this program.
16. Related Party Transactions
Related party transactions are defined as transactions between the Company and entities either controlled by the Company or that the Company can significantly influence. Although SoftBank has a controlling interest in HAPSMobile, the Company determined that it has the ability to exercise significant influence over HAPSMobile. As such, HAPSMobile and SoftBank are considered related parties of the Company. Concurrent with the formation of