Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2015

Summary of Activity of Stock Incentive and Equity Plans

The following table summarizes the activity of the stock incentive and equity plans:

	Shares available for grant			Number of options outstanding			Weighted- average option exercise price		Number of restricted stock shares issued			Number of restricted stock units outstanding
Outstanding at January 1, 2013		2,200,604			2,117,110		$	13.32		59,932			—
Granted		(216,913	)		97,265			8.43		73,707			45,941
Exercised		—			(27,930	)		5.02		—			—
Canceled/forfeited		256,412			(260,375	)		18.31		—			—
Outstanding at December 31, 2013		2,240,103			1,926,070			12.46		133,639			45,941
Granted		(706,056	)		574,950			5.04		27,925			103,181
Exercised		—			(47,654	)		5.37		—			(10,525	)
Canceled/forfeited		238,482			(215,080	)		16.72		(20,911	)		(3,866	)
Outstanding at December 31, 2014		1,772,529			2,238,286			10.31		140,653			134,731
Granted		(1,457,826	)		992,684			1.40		60,802			404,340
Exercised/issued		—			(5,692	)		0.78		—			(29,432	)
Canceled/forfeited		417,567			(373,710	)		10.02		—			(55,618	)
Outstanding at December 31, 2015		732,270			2,851,568		$	7.07		201,455			454,021

Intrinsic Value Calculated Based on Grant Date Fair Value

The following table sets forth option grants made during 2015, 2014 and 2013 with intrinsic value calculated based on grant date fair value.

Date of Grant	Number of options granted		Exercise price		Intrinsic value per share
January – July 2013		82,815		$6.60 - $7.97		—
October 2013		14,450		$12.11		—
January – July 2014		39,300		$7.69 - $11.29		—
September 2014		300,000		$4.30 - $5.20		—
October – December 2014		235,650		$4.25 - $4.41		—
March – July 2015		92,600		$2.43 - $4.04		—
September – December 2015		900,084		$1.00 - $1.35		—

Exercise Prices of Outstanding Options

At December 31, 2015, the exercise prices of outstanding options were as follows:

Exercise Price	Number of options outstanding		Average remaining contractual life (years)		Number of options exercisable
$0.78 - $4.94		1,617,436		7.83		488,681
$5.12 - $9.95		554,684		5.29		439,526
$10.02 - $14.00		238,542		3.95		230,494
$15.00 - $18.80		29,776		2.98		29,776
$19.21 - $22.92		356,475		4.03		356,475
$24.95 - $32.67		54,655		4.51		54,655
		2,851,568		6.42		1,599,607

Summary of Non-vested Options

The following table summarizes the activity of non-vested options:

	Non-vested options			Weighted- Average Option Exercise price
Non-vested at January 1, 2013		821,002		$	15.24
Granted		97,265			8.43
Vested		(380,413	)		12.50
Cancelled		(211,288	)		18.55
Non-vested at December 31, 2013		326,566			13.57
Granted		574,950			5.04
Vested		(169,361	)		14.84
Cancelled		(103,422	)		12.74
Non-vested at December 31, 2014		628,733			5.93
Granted		992,684			1.40
Vested		(200,402	)		6.64
Cancelled		(169,054	)		5.86
Non-vested at December 31, 2015		1,251,961		$	2.23

Schedule for Estimated Fair Value at Date of Option Grant Using Black Scholes Option Pricing Model

For the years ended December 31, 2015, 2014 and 2013, the assumptions used for the estimated fair value at the date of option grant using the Black-Scholes option-pricing model were as follows:

	2015	2014	2013
Weighted average fair value per share of option	$1.40	$5.04	$8.49
Expected term	5.5 years	5.3 years	5.3 years
Risk free interest rate	1.41% -1.70%	1.66% -1.83%	0.76% -1.42%
Volatility	65%	77%	77%
Dividend yield	None	None	None
Forfeiture rate	18.56%	25.56%	19.18%

Restricted Stock Units [Member]

Analysis of Restricted Stock Units Issued

A summary of the Company’s restricted stock units (“RSUs”) is as follows:

	RSUs outstanding			Weighted average price at time of grant		Aggregate intrinsic value
Non-vested restricted stock units as of January 1, 2013		—		$	—
Granted		45,941			8.60
Non-vested restricted stock units as of December 31, 2013		45,941			8.60
Granted		103,181			4.43
Vested		(10,525	)		8.60
Cancelled		(3,866	)		8.60
Non-vested restricted stock units as of December 31, 2014		134,731			5.41
Granted		404,340			1.48
Vested		(29,432	)		5.44
Cancelled		(55,618	)		5.37
Non-vested at December 31, 2015		454,021		$	1.92	$	517,584

Restricted Stock [Member]

Analysis of Restricted Stock Units Issued

An analysis of restricted stock issued is as follows:

Non-vested restricted stock as of January 1, 2013	4,336
Granted	73,707
Vested	(24,329	)
Non-vested restricted stock as of December 31, 2013	53,714
Granted	27,925
Vested	(48,521	)
Cancelled	(20,911	)
Non-vested restricted stock as of December 31, 2014	12,207
Granted	60,802
Vested	(57,809	)
Non-vested restricted stock as of December 31, 2015	15,200