Stock-Based Compensation (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Summary of stock option activity
Number of shares beginning balance	11,003,963
Number of shares granted	2,197,500	1,662,500
Number of shares exercised
Number of shares forfeited	(37,500)
Number of shares expired	(180,000)
Number of shares ending balance	12,983,963
Number of shares options vested and expected to vest at June 30, 2012	12,321,673
Number of shares options exercisable at June 30, 2012	5,846,575
Weighted average exercise price beginning balance	$ 0.41
Weighted average exercise price granted	$ 0.48
Weighted average exercise price exercised	$ 0.00
Weighted average exercise price forfeited	$ 0.40
Weighted average exercise price expired	$ 0.40
Weighted average exercise price ending balance	$ 0.42
Weighted average exercise price options vested and expected to vest at June 30, 2012	$ 0.42
Weighted average exercise price options exercisable at June 30, 2012	$ 0.42
Weighted average remaining contractual term ending balance	8 years 22 days
Weighted average remaining contractual term options vested and expected to vest at June 30, 2012	8 years
Weighted average remaining contractual term options exercisable at June 30, 2012	7 years 29 days
Aggregate intrinsic value Options vested and expected to vest at June 30, 2012	$ 227
Aggregate intrinsic value Options exercisable at June 30, 2012	190
Aggregate intrinsic value ending balance	$ 228