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Common stock (Tables)

12 Months Ended

Dec. 31, 2018

The following is a summary of restricted common stock activity:



	Number of Shares		Weighted-Average Grant Date Fair Value
Unvested at December 31, 2017	5,334		$	10.51
Issued	—		—
Vested	(3,250	)	10.16
Forfeited	—		—
Unvested at December 31, 2018	2,084		$	11.05

The following is a summary of restricted common stock activity:



	Number of Shares		Weighted-Average Grant Date Fair Value
Unvested at December 31, 2017	169,654		$	0.10
Issued	—		—
Vested	(169,654	)	0.10
Forfeited	—		—
Unvested at December 31, 2018	—		$	—

Shares reserved for future issuance

The Company has reserved the following number of shares of common stock for future issuance:



	As of December 31,
	2018	2017
Stock-based compensation awards	4,061,397	3,439,820
Vesting of restricted common stock	2,084	174,988
Employee stock purchase plan	713,996	534,274
Total	4,777,477	4,149,082

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

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+ Details