Consolidated Statements of Mandatorily Redeemable Convertible Preferred Stock and Changes in Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data, unless otherwise specified		Total USD ($)	Preferred Stock USD ($)		Common Stock USD ($)		Common Stock Series F	Additional Paid-in Capital USD ($)	Additional Paid-in Capital Series F USD ($)	Accumulated Other Comprehensive Income USD ($)	Accumulated Deficit USD ($)	Accumulated Deficit Series F USD ($)
Balance at Dec. 31, 2012		$ (63,472)	$ 162,466	[1],[2]	$ 1	[1],[3],[4]		$ 17,752		$ 345	$ (81,570)
Balance (in shares) at Dec. 31, 2012	[1]		32,563,192	[2]	7,722,262	[3],[4]
Increase (Decrease) in Stockholders' Equity
Accretion of issuance costs		(191)	191	[1],[2]				(191)
Common stock issuance, net of $8,402 issuance costs		66,598			1	[1],[3]		66,597
Common stock issuance (in shares)	[1],[3],[4]				7,500,000
Conversion of preferred stock		162,657	(162,657)	[1],[2]	3	[1],[3],[4]		162,654
Conversion of preferred stock (in shares)	[1]		(32,563,192)	[2]	32,587,453	[3],[4]
Series F preferred stock deemed dividend	[5]								15,849			(15,849)
Series F preferred stock deemed dividend (in shares)	[1],[3],[4],[5]						1,584,863
Reclassification of liability warrants to equity warrants		790						790
Exercise of warrants (in shares)	[1],[3],[4]				64,067
Exercise of stock options		492						492
Exercise of stock options (in shares)		180,163			180,163	[1],[3],[4]
Stock-based compensation expense		2,419						2,419
Net loss		(7,675)									(7,675)
Foreign currency translation adjustments		(100)								(100)
Balance at Sep. 30, 2013		$ 161,518			$ 5	[1],[3],[4]		$ 266,362		$ 245	$ (105,094)
Balance (in shares) at Sep. 30, 2013	[1],[3],[4]				49,638,808

[1] All share amounts have been restated to reflect a 1-for-1.5 reverse stock split, refer to note 10.

[2] The Preferred Stock, as of December 31, 2012, included several series of Preferred Stock, refer to note 10.

[3] The Common Stock, as of December 31, 2012, included two series of Common Stock, refer to note 10.

[4] All share amounts have been restated to reflect the renaming of the Company's "Series I common stock" to "common stock", refer to note 10.

[5] Represents a one-time non-cash deemed dividend related to the series F preferred stock ratchet provision, refer to note 10.