Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Summary of Stock Options Activity

The following table summarizes stock option activity for the Company during the three years ended December 31, 2015:

	Options		Weighted Average Exercise Price		Weighted Average Contractual Term	Aggregate Intrinsic Value
Outstanding December 31, 2012	10,581,194		$	1.16
Granted	862,287		$	2.67
Exercised	(829,702	)	$	0.92
Forfeited or expired	(147,084	)	$	1.81
Outstanding December 31, 2013	10,466,695		$	1.37
Granted	547,117		$	1.28
Exercised	(624,047	)	$	2.36
Forfeited or expired	(1,075,000	)	$	1.08
Outstanding December 31, 2014	9,314,765		$	1.33
Granted	1,843,000		$	0.54
Exercised	(50,000	)	$	0.27
Forfeited or expired	(387,861	)	$	1.76
Outstanding December 31, 2015	10,719,904		$	1.18	3.12	$	—
Vested or expected to vest at December 31, 2015	8,263,962

Summary of Carrying Value of Warrant Liability

The gain included in net loss is reflective of several changes in the assumptions used in the computation of fair value, including the decrease in the Company's stock price, during the years ended December 31, 2015, 2014 and 2013.

	2015			2014			2013
Beginning Balance, January 1	$	597,719		$	1,064,810		$	2,852,880
Issuance of warrants and effect of repricing	4,286,314			62,683			—
Exercise of warrants	—			—			(1,145,659		)
(Gain) or loss included in earnings	(2,925,258		)	(529,774		)	(642,411		)
Transfers in and/or out of Level 3	—			—			—
Ending Balance December 31,	$	1,958,775		$	597,719		$	1,064,810