Redeemable Convertible Preferred Stock (Tables)

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Summary of Activity for Preferred Stock

The following table presents a summary of activity for the preferred stock issued and outstanding for the six months endedJune 30, 2014 (in thousands):

	Series A		Series B		Series C		Series C-1		Series D		Series E		Total Amount
Balance, January 1, 2014	$	2,559	$	22,918	$	24,749	$	5,401	$	62,716	$	—	$	118,343
Issuance of preferred stock	—		—		—		—		—		77,000		77,000
Accretion of dividends on preferred stock	65		634		818		188		2,407		2,088		6,200
Balance, June 30, 2014	$	2,624	$	23,552	$	25,567	$	5,589	$	65,123	$	79,088	$	201,543