	Three Months Ended				Six Months Ended
	September 30, 2019		September 30, 2018		September 30, 2019		September 30, 2018
	(In thousands)
Weighted average:
Common shares outstanding used in calculating basic net income (loss) per share attributable to Viasat, Inc. common stockholders		61,480		59,734		61,200		59,470
Options to purchase common stock as determined by application of the treasury stock method		174		—		—		—
TSR performance stock options to purchase common stock as determined by application of the treasury stock method		—		—		—		—
Restricted stock units to acquire common stock as determined by application of the treasury stock method		973		—		—		—
Potentially issuable shares in connection with certain terms of the ViaSat 401(k) Profit Sharing Plan and Employee Stock Purchase Plan		134		—		—		—
Shares used in computing diluted net income (loss) per share attributable to Viasat, Inc. common stockholders		62,761		59,734		61,200		59,470

Antidilutive shares excluded from the calculation consisted of 28,554 shares related to stock options (other than TSR performance stock options), 1,215,219 shares related to TSR performance stock options and 15,180 shares related to restricted stock units for the three months ended September 30, 2019.

The weighted average number of shares used to calculate basic and diluted net loss per share attributable to Viasat, Inc. common stockholders is the same for the six months ended September 30, 2019, and the three and six months ended September 30, 2018, as the Company incurred a net loss attributable to Viasat, Inc. common stockholders for such periods and inclusion of potentially dilutive weighted average shares of common stock would be antidilutive. Potentially dilutive weighted average shares of common stock excluded from the calculation for the six months ended September 30, 2019 comprised 251,961 shares relating to stock options (other than TSR performance stock options), 653,725 shares relating to TSR performance stock options, 990,984 shares relating to restricted stock units, and 209,765 shares relating to certain terms of the ViaSat 401(k) Profit Sharing Plan and Employee Stock Purchase Plan. Potentially dilutive weighted average shares of common stock excluded from the calculation for the three and six months ended September 30, 2018 were 1,313,881 and 1,309,180 shares relating to stock options (other than TSR performance stock options), respectively, 630,254 and 480,518 shares relating to restricted stock units, respectively, and 138,478 and 205,030 shares relating to certain terms of the ViaSat 401(k) Profit Sharing Plan and Employee Stock Purchase Plan, respectively. No shares relating to the TSR performance stock options were excluded from the calculation for the three and six months ended September 30, 2018.