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Additional Paid-in Capital (Tables)

6 Months Ended

Jun. 30, 2012

Additional Paid-in Capital [Abstract]

Additional paid-in capital

		Warrants				Stock based compensation				Compensation options				Other paid-in capital				Total additional paid-in capital
As of December 31, 2011			10,288			$	5,065			$	588			$	8,729			$	24,670
Warrant exercise			(464	)			-				-				464				-
Stock options expensed			-				442				-				-				442
Restricted stock units expensed			-				1,550				-				-				1,550
Compensation options exercised			-				-				(294	)			294				-
As of June 30, 2012			9,824			$	7,057			$	294			$	9,487			$	26,662

Warrant activity

Warrant activity is summarized in the following table:

		Warrants outstanding				Valuation				Weighted average exercise price per share				Weighted average remaining life (yrs.)				Intrinsic value
As of December 31, 2011			15,850,238			$	10,288			$	3.45				3.7			$	485
Exercised			(478,261	)		$	(464	)
As of June 30, 2012			15,371,977			$	9,824			$	3.49				3.3			$	93

Compensation options

Compensation Options

		Compensation options outstanding				Valuation			Expiry date		Weighted average remaining life (yrs.)
As of December 31, 2011			450,000			$	588
Exercise			(225,000	)			(294	)
As of June 30, 2012			225,000			$	294		Apr-13			0.8

Summary of the fair value of all awards issued under Vista's stock compensation plans

		June 30,				December 31,
		2012				2011
Balance, beginning of period		$	5,065			$	4,695
Stock options			442				238
Restricted stock units			1,550				132
Balance, end of period		$	7,057			$	5,065

Summary of option activity

A summary of option activity under the Plan as of June 30, 2012 and changes during the quarter then ended is set forth in the following table:

		Number of shares				Weighted average exercise price per share				Weighted average remaining contractual term				Aggregate intrinsic value
Outstanding - December 31, 2011			3,195,000			$	3.27				2.73			$	1,039
Outstanding - June 30, 2012			3,195,000				3.27				2.23				792
Exercisable - June 30, 2012			3,017,500			$	3.25				2.12			$	792

Unvested stock options

		Number of shares				Weighted average grant-date fair value per share				Weighted average remaining amortization period (Years)
Unvested - December 31, 2011			597,500			$	1.60
Vested			(420,000	)			1.51
Unvested - June 30, 2012			177,500			$	1.82				0.29

RSU activity under LTIP

		Number of units				Weighted average grant-date fair value
Unvested - December 31, 2011			960,000			$	3.84
Granted			350,000				3.07
Unvested - June 30 , 2012			1,310,000			$	3.63

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Tabular disclosure of the changes in outstanding nonvested shares.

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