v2.4.0.6

Stock Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Number of Shares [Roll Forward]
Options outstanding at December 31, 2011 (in shares)			891,751
Granted (in shares)			932,384
Exercised (in shares)			0
Forfeited (in shares)			(78,525)
Cancelled (in shares)			(55,251)
Options outstanding at September 30, 2012 (in shares)	1,690,359		1,690,359
Vested and expected to vest at September 30, 2012 (in shares)	1,558,961		1,558,961
Exercisable at September 30, 2012 (in shares)	310,000		310,000
Non vested			1,380,359
Weighted average remaining recognition period (in years)			3 years 7 months 24 days
Weighted Average Exercise Price [Roll Forward]
Options outstanding at December 31, 2011 (in dollars per share)			$ 5.15
Granted (in dollars per share)			$ 3.63
Exercised (in dollars per share)			$ 0
Forfeited (in dollars per share)			$ 3.03
Cancelled (in dollars per share)			$ 18.93
Options outstanding at September 30, 2012 (in dollars per share)	$ 3.96		$ 3.96
Vested and expected to vest at September 30, 2012 (in dollars per share)	$ 4.00		$ 4.00
Exercisable at September 30, 2012 (in dollars per share)	$ 5.72		$ 5.72
Weighted Average Remaining Contractual Life in Years [Abstract]
Options outstanding at September 30, 2012			8 years 1 month 10 days
Vested and expected to vest at September 30, 2012			7 years 11 months 19 days
Exercisable at September 30, 2012			1 year 6 months 4 days
Aggregate Intrinsic Value [Abstract]
Options outstanding at September 30, 2012	$ 1,600,309,000		$ 1,600,309,000
Vested and expected to vest at September 30, 2012	1,464,563,000		1,464,563,000
Exercisable at September 30, 2012	156,712,000		156,712,000
Fair value and assumptions used in determining fair value of stock options [Abstract]
Volatility (in hundredths)			1.20%
Risk-free interest rate (in hundredths)			0.60%
Dividend yield (in hundredths)			0.00%
Expected option term (in years)			6 years 3 months
Unrecognized compensation expense related to unvested stock options	3,300,000		3,300,000
Expected weighted average period for recognizing unrecognized compensation expense			3 years 7 months 24 days
Restricted Stock and Restricted Stock Units [Abstract]
Number of common shares to be received in lieu of per RSU (in shares)	1		1
Requisite service period of RS and RSUs			3 years
Number of RSU's [Roll Forward]
Outstanding at December 31, 2011 (in shares)			487,025
Granted (in shares)			61,011
Released (in shares)			(43,819)
Forfeited (in shares)			(8,559)
Outstanding at September 30, 2012 (in shares)	495,658		495,658
Expected to Vest (in shares)	351,013		351,013
Weighted Average Grant Price [Roll Forward]
Outstanding at December 31, 2011 (in dollars per share)			$ 6.37
Granted (in dollars per share)			$ 3.44
Released (in dollars per share)			$ 5.98
Forfeited (in dollars per share)			$ 5.78
Outstanding at September 30, 2012 (in dollars per share)	$ 5.11		$ 5.11
Expected to Vest (in dollars per share)	$ 5.68		$ 5.68
Unrecognized compensation expense related to unvested RSU's	1,200,000		1,200,000
Common stock were reserved for issuance (in shares)	1,000,000		1,000,000
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity compensation plans	2		2
Term of equity compensation plan (in years)			P10Y
Number of Shares [Roll Forward]
Weighted average remaining recognition period (in years)			3 years 7 months 24 days
Fair value and assumptions used in determining fair value of stock options [Abstract]
Allocated share-based compensation expense	400,000	100,000	700,000	200,000
Expected weighted average period for recognizing unrecognized compensation expense			3 years 7 months 24 days
Options [Member] | General and Administrative Expense [Member]
Fair value and assumptions used in determining fair value of stock options [Abstract]
Allocated share-based compensation expense	300,000	100,000	500,000	100,000
Options [Member] | Research and Development Expense [Member]
Fair value and assumptions used in determining fair value of stock options [Abstract]
Allocated share-based compensation expense	100,000		200,000	40,000
Options [Member] | Maximum [Member] | Research and Development Expense [Member]
Fair value and assumptions used in determining fair value of stock options [Abstract]
Allocated share-based compensation expense		100,000
Options [Member] | 2000 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares of common stock authorized (in shares)			3,000,000
Reserved for future issuance maximum shares of common stock (in shares)	3,900,000		3,900,000
Options [Member] | 2000 ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for future issuance maximum shares of common stock (in shares)	150,000		150,000
Restricted Stock Units (RSUs) [Member]
Number of Shares [Roll Forward]
Weighted average remaining recognition period (in years)			1 year 18 days
Fair value and assumptions used in determining fair value of stock options [Abstract]
Allocated share-based compensation expense	100,000	400,000	800,000	900,000
Expected weighted average period for recognizing unrecognized compensation expense			1 year 18 days
Restricted Stock Units (RSUs) [Member] | General and Administrative Expense [Member]
Fair value and assumptions used in determining fair value of stock options [Abstract]
Allocated share-based compensation expense	100,000	300,000	500,000	600,000
Restricted Stock Units (RSUs) [Member] | Research and Development Expense [Member]
Fair value and assumptions used in determining fair value of stock options [Abstract]
Allocated share-based compensation expense	$ 100,000	$ 100,000	$ 300,000	$ 300,000

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