Mandatorily Redeemable Convertible Preferred Stock (Tables)

12 Months Ended

Dec. 31, 2012

Equity [Abstract]

Schedule of Mandatorily Redeemable Convertible Preferred Stock Prior to Conversion [Table Text Block]

The following table summarizes information related to the Company’s mandatorily redeemable convertible preferred stock prior to conversion into common stock (in thousands, except par value):

Series	Par Value		Shares Authorized	Shares Outstanding	Liquidation Preference		Proceeds Net of Issuance Costs
A	$	0.001	5,050	4,195	$	4,195	$	4,150
B	0.001		6,250	6,217	64,830		35,455
C	0.001		4,004	2,730	4,348		4,302
			15,304	13,142	$	73,373	$	43,907