Common Stock

12 Months Ended

Dec. 31, 2013

Equity [Abstract]

Common Stock

7. Common Stock

On February 12, 2013, the Company’s Board of Directors approved a Restated Certificate of Incorporation, which became effective upon the consummation of the Company’s initial public offering. The Restated Certificate of Incorporation amends the authorized share capital to 500,000 shares of common stock ($0.001 par value per share) and 10,000 shares of blank-check preferred stock ($0.001 par value per share).

As of December 31, 2013 and 2012, reserved shares of common stock are as follows:

	December 31,
	2013		2012
Common stock issuable upon exercise of warrants		—		114
Options available for future grant under stock option plans		4,585		724
Options outstanding under stock option plans		4,855		4,314
Shares available for future issuance under ESPP		854		—
Conversion of convertible preferred stock		—		18,804
		10,294		23,956

During 2012, the Company entered into common stock purchase agreements (“CSPAs”) with two members of the Board of Directors. In connection with the CSPAs, the Company sold 84 shares of common stock for a cumulative purchase price of $500. The underlying shares vest ratably on a monthly basis over 24 months. The CSPAs include a repurchase feature which provides the Company the option, but not the obligation, to repurchase any unvested shares upon termination at the original purchase price. As of December 31, 2013, 11 common shares issued under the CSPAs were unvested.