8.Redeemable Convertible Preferred Stock

The following table summarizes the Company’s issuances of redeemable convertible preferred stock:

Issue Date	Series	Purchase Price per Share		Number of Shares	Conversion Price per Share
June 2009	Series A	$	1.27	10,033,976	$	1.27
February 2010	Series B	$	4.46	5,057,901	$	4.46
March 2011	Series C	$	7.34	4,429,601	$	7.34
March 2012	Series D	$	7.81	3,339,902	$	7.81
January 2013	Series D	$	7.81	639,828	$	7.81

Each of the purchase prices per share above excludes the cost of issuance. Any costs incurred in connection with the issuance of the various classes of preferred stock have been recorded as a reduction of the carrying amount of the preferred stock and were accreted through a charge to additional paid-in capital through April 2, 2014.

Summary of Activity

The following table presents a summary of activity for the redeemable convertible preferred stock issued and outstanding for the periods presented below (in thousands):

	Redeemable Convertible Preferred Stock
	Series A			Series B			Series C			Series D			Total Amount
Balance, December 31, 2013	$	12,384		$	22,210		$	32,405		$	31,048		$	98,047
Accretion of issuance costs on redeemable convertible preferred stock	36			36			12			5			89
Conversion of preferred stock into common stock	(12,420		)	(22,246		)	(32,417		)	(31,053		)	(98,136		)
Balance, September 30, 2014	$	—		$	—		$	—		$	—		$	—

Upon closing of the Company’s IPO on April 2, 2014, all outstanding shares of redeemable convertible preferred stock automatically converted into an aggregate of 23,501,208 shares of common stock.