Redeemable Convertible Preferred Stock and Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2014

Equity [Abstract]

Summary of Redeemable Convertible Preferred Stock

The tables below represent a rollforward of the Redeemable Convertible Preferred Stock:

	Series A Redeemable Convertible Preferred Stock					Series B Redeemable Convertible Preferred Stock					Series B-1 Redeemable Convertible Preferred Stock
	Shares		Amount			Shares		Amount			Shares		Amount
Balances at December 31, 2011	705,400		$	802		694,000		$	639		1,212,360		$	1,300
Accretion of dividends	—		556			—		30			—		60
Balances at December 31, 2012	705,400		1,358			694,000		669			1,212,360		1,360
Accretion of dividends	—		52			—		19			—		37
Conversion to common stock	(705,400	)	(1,410		)	(694,000	)	(688		)	(1,212,360	)	(1,397		)
Balances at December 31, 2013	—		$	—		—		$	—		—		$	—

	Series C Redeemable Convertible Preferred Stock					Series C-1 Redeemable Convertible Preferred Stock					Series C-2 Redeemable Convertible Preferred Stock
	Shares		Amount			Shares		Amount			Shares		Amount
Balances at December 31, 2011	4,546,360		$	6,729		15,934,528		$	32,264		18,617,020		$	41,987
Accretion of dividends	—		405			—		1,937			—		2,525
Balances at December 31, 2012	4,546,360		7,134			15,934,528		34,201			18,617,020		44,512
Accretion of dividends	—		266			—		1,272			—		1,660
Conversion to common stock	(4,546,360	)	(7,400		)	(15,934,528	)	(35,473		)	(18,617,020	)	(46,172		)
Balances at December 31, 2013	—		$	—		—		$	—		—		$	—

	Series C-3 Redeemable Convertible Preferred Stock					Series D Redeemable Convertible Preferred Stock					Series E Redeemable Convertible Preferred Stock
	Shares		Amount			Shares		Amount			Shares		Amount
Balances at December 31, 2011	13,297,872		$	28,082		19,803,685		$	71,924		22,285,716		$	117,954
Issuance of shares	—		—			—		—			15,809,523		83,000
Accretion of dividends	—		1,688			—		4,328			—		10,465
Stock issuance costs	—		—			—		—			—		(16		)
Balances at December 31, 2012	13,297,872		29,770			19,803,685		76,252			38,095,239		211,403
Accretion of dividends	—		1,103			—		2,827			—		7,931
Conversion to common stock	(13,297,872	)	(30,873		)	(19,803,685	)	(79,078		)	(38,095,239	)	(219,332		)
Settlement of fractional shares upon conversion to common stock	—		—			—		(1		)	—		(2		)
Balances at December 31, 2013	—		$	—		—		$	—		—		$	—

	Series F Redeemable Convertible Preferred Stock
	Shares		Amount
Balances at December 31, 2012	—		$	—
Issuance of shares	19,047,619		150,000
Accretion of dividends	—		3,224
Stock issuance costs	—		(3,148		)
Conversion to common stock	(19,047,619	)	(150,075		)
Settlement of fractional shares upon conversion to common stock	—		(1		)
Balances at December 31, 2013	—		$	—