Stock-Based Awards

9 Months Ended

Sep. 30, 2011

Stock-Based Awards [Abstract]

Stock-Based Awards

5. Stock-Based Awards

Stock Options and Restricted Stock

The Company grants stock options to employees, certain directors and non-employee consultants and special advisors for services. Options are issued generally for terms of ten years and vest between two to four years. Options are issued with an exercise price equal to the fair value of the Company on the date of grant. The Company estimated the fair value for options using the Black-Scholes Option Pricing Model.

The Company grants restricted stock to employees and certain directors. All restricted stock awards require future service as a condition of delivery of the underlying shares of common stock along with certain other requirements outlined in the award agreements. Restricted stock awards generally vest over one to four years.

From time-to-time, the Company also grants restricted and common stock to nonemployee consultants, special advisors and vendors for services. In general, theses awards vest over the contractual period of the consulting arrangement. The fair value of these awards is measured at the grant dated fair value and re-measured at each reporting period. Fair value is determined as the closing price of the Company's common stock on the date of grant.

A summary of options and restricted stock activity is as follows:

	Options			Weighted Average Exercise Price of Options		Restricted Stock Awards
Balance at January 1, 2011		21,443,617		$	0.60		2,158,509
Granted		755,000		$	5.68		561,526
Exercised/vested		(535,842	)	$	1.12		(1,251,896	)
Forfeitures or expirations		(109,066	)	$	2.32		(25,405	)
Balance at September 30, 2011		21,553,709		$	0.76		1,442,734

A summary of stock-based compensation expense is as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Employees and directors	$	995	$	1,492	$	3,374	$	5,319
Non-employees		808		476		2,053		1,210
Total	$	1,803	$	1,968	$	5,427	$	6,529