Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2013

Stockholders' Equity [Abstract]

Schedule of Warrants Outstanding

Series	Number of Warrants		Exercise Price		Expiration Date
J		200,893	$	6.16		May 31, 2013
K		236,564	$	9.60		April 1, 2013
L		6,250	$	3.12		March 31, 2014
N		100,000	$	6.25		February 22, 2015
O		230,900	$	5.50		February 22, 2015
P		2,508	$	6.25		February 16, 2015
Q		133,333	$	5.50		February 22, 2015
R		1,832,602	$	9.90		June 22, 2016
Total		2,743,050

Weighted Average Assumptions Used in Estimation of Fair Value of Option Awards

	Three Months Ended March 31,
	2013			2012
Risk-free interest rate		1.27	%		1.23	%
Volatility factor		69.9	%		75.4	%
Dividend yield		0	%		0	%
Expected option life (years)		6.25			6.25

Summary of Stock Option Activity

	Options			Weighted Average Exercise Price
Outstanding - January 1, 2013		1,639,985		$	6.38
Granted		193,980		$	12.00
Exercised		(36,626	)	$	4.15
Forfeited		(2,938	)	$	9.16
Outstanding - March 31, 2013		1,794,401		$	7.08
Expected to vest - March 31, 2013		1,776,457		$	7.08
Exercisable at March 31, 2013		1,392,012		$	6.33

Allocation of Stock Option Compensation Expense

	Three Months Ended March 31,
	2013		2012
Cost of sales	$	54,707	$	43,917
Selling, general and administrative expenses		508,606		355,546
Research and development		57,760		6,133
Total stock option compensation expense	$	621,073	$	405,596

Summary of Restricted Share Unit Activity

	Number of Shares			Weighted Average Fair Value
Unvested January, 1, 2013		786,900		$	7.07
Granted		5,000			12.08
Vested		(27,900	)		9.35
Unvested, March 31, 2013		764,000		$	8.78

Allocation of Restricted Share Unit Compensation Expense

	Three Months Ended March 31,
	2013		2012
Cost of sales	$	-	$	5,198
Selling, general and administrative expenses		531,596		84,124
Total restricted share unit compensation expense	$	531,596	$	89,322

Common Stock Shares Reserved for Future Issuance

Convertible preferred shares (series A - B)	73,332
Additional stock issuable related to conversion of preferred stock	189,205
Common stock options outstanding	1,794,401
Common stock warrants outstanding	2,743,050
Restricted share units outstanding	764,000
Common stock equivalents available for grant	1,964
Total common stock shares reserved	5,565,952