Stock Option Plan (Tables)

12 Months Ended

Dec. 31, 2018

Text Block [Abstract]

Transaction under Stock Option Plan

Transactions under the 2012 Plan for the years ending December 31, 2018, 2017, and 2016 were as follows:

(in thousands, except share and per share data)	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding, December 31, 2015		3,481,468		$	4.96
Granted		362,800			6.40
Exercised		(234,833	)		4.57
Cancelled		(144,100	)		6.43
Outstanding, December 31, 2016		3,465,335			5.07
Granted		688,800			5.27
Exercised		(180,000	)		3.67
Cancelled		(122,000	)		6.64
Outstanding, December 31, 2017		3,852,135			5.12
Granted		1,744,950			2.35
Exercised		(104,167	)		2.30
Cancelled		(215,833	)		5.72
Outstanding, December 31, 2018		5,277,085		$	4.24		6.86	$	88
Options exercisable, December 31, 2018		3,099,935		$	5.15		4.93	$	88
Options exercisable, December 31, 2017		2,925,502		$	5.12		5.58	$	1,152
Options available for future grant at December 31, 2018		3,895,923

Summary of Non-Vested Restricted Stock

A summary of the status of non-vested restricted stock as of December 31, 2018, 2017 and 2016 is as follows:

	Number of Shares			Weighted-Average Grant Date Fair Value
Non-vested, December 31, 2015		1,586,388		$	9.00
Granted		711,770			5.35
Vested		(617,666	)		8.90
Cancelled		—			—
Non-vested, December 31, 2016		1,680,492			7.49
Granted		907,032			4.14
Vested		(778,965	)		7.66
Cancelled		—			—
Non-vested, December 31, 2017		1,808,559			5.74
Granted		150,321			1.87
Vested		(1,005,377	)		6.62
Cancelled		(271,433	)		5.00
Non-vested, December 31, 2018		682,070		$	3.47