Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock options granted and weighted-average grant-date fair value

The following table summarizes all stock option activity for the six months ended June 30, 2016:

	Number of Shares		Weighted- Average Grant- Date Fair Value	Weighted-Average Remaining Contractual Term (Years)
Balance as of December 31, 2015	4,602,746		8.74
Granted	120,371		2.85
Exercised	—		—
Forfeited	(300,332	)	7.54
Vested options expired	(326,134	)	18.47
Balance as of June 30, 2016	4,096,651		7.88	5.93
Exercisable as of June 30, 2016	2,551,045		10.02	3.27

Schedule of unvested shares granted and weighted-average grant-date fair value

The following table summarizes all unvested share activity for the six months ended June 30, 2016:

	Number of Shares		Weighted- Average Grant- Date Fair Value
Balance as of December 31, 2015	962,446		$	6.57
Granted	690,508		2.71
Vested	(251,505	)	7.70
Forfeited	(122,277	)	7.66
Unvested shares outstanding at June 30, 2016	1,279,172		$	4.16

Schedule of performance shares granted and weighted-average grant-date fair value

The following table summarizes all cash performance stock unit activity for the six months ended June 30, 2016:

	Number of Shares	Weighted- Average Grant- Date Fair Value
Balance as of December 31, 2015	—	$	—
Granted	512,127	2.69
Settled	—	—
Forfeited	—	—
Cash performance stock units outstanding at June 30, 2016	512,127	$	2.69

The following table summarizes all performance stock unit activity for the six months ended June 30, 2016:

	Number of Shares		Weighted- Average Grant- Date Fair Value
Balance as of December 31, 2015	701,384		$	4.51
Granted	473,000		1.9
Settled	—		—
Forfeited	(197,647	)	6.88
Performance stock units outstanding at June 30, 2016	976,737		$	2.76

Schedule of phantom shares granted and weighted-average grant-date fair value

The following table summarizes all phantom stock activity for the six months ended June 30, 2016:

	Number of Shares	Weighted- Average Grant- Date Fair Value
Balance as of December 31, 2015	—	$	—
Granted	781,645	2.69
Exercised	—	—
Forfeited	—	—
Phantom stock units outstanding at June 30, 2016	781,645	$	2.69