Basic net loss per common share is computed by dividing net loss by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by giving effect to all potential dilutive shares of common stock. Basic and diluted net loss per share of common stock were the same for all periods presented as the impact of all potentially dilutive securities outstanding was anti-dilutive. The Company uses the if converted method for calculating any potential dilutive effect on diluted loss per share.

The following common equivalent shares were excluded from the diluted net loss per share calculation because their inclusion would have been anti-dilutive:

	As of September 30,
	2019		2018
Stock options		797,848		1,836,671
Convertible senior notes		3,411,199		3,411,199
Non-vested performance-based restricted stock units		594,723		93,362
Non-vested market-based restricted stock units		—		11,877
Non-vested restricted stock units		650,093		417,209
Total		5,453,863		5,770,318

The Company is required to reserve and keep available from the Company’s authorized but unissued shares of common stock a number of shares equal to the number of shares subject to outstanding awards under the 2008 Plan and the number of shares reserved for issuance under each of the 2016 Plan and 2016 ESPP.

The amount of such shares of the Company’s common stock reserved for these purposes at September 30, 2019 is as follows:

	Number of Shares
Stock options issued and outstanding		797,848
Additional shares available for grant under equity plans		2,394,561
Total		3,192,409

In connection with the issuance of the Notes in November 2017, the Company paid $12.9 million to enter into capped call option agreements to reduce the potential dilution to holders of the Company’s common stock upon conversion of the Notes. The capped call option agreements are excluded from the calculation of diluted net loss per share attributable to common stockholders, as their effect is antidilutive.