Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

The following table summarizes all stock option activity for the three months ended March 31, 2017:



	Number of Shares		Weighted- Average Grant- Date Fair Value		Weighted Average Remaining Contractual Term(Years)
Balance as of December 31, 2016	3,705,893		$	7.72
Granted	—		—
Exercised	—		—
Forfeited	(21,247	)	6.77
Vested options expired	(688,723	)	11.57
Balance as of March 31, 2017	2,995,923		6.85		5.48

Vested and expected to vest as of March 31, 2017	2,995,923		$	6.85	5.48

Exercisable as of March 31, 2017	2,069,688		$	8.50	3.42

The following table summarizes all unvested share activity for the three months ended March 31, 2017:



	Number of Shares		Weighted- Average Grant- Date Fair Value
Balance as of December 31, 2016	945,252		$	3.76
Granted	—		—
Vested	(62,571	)	5.59
Forfeited	(8,076	)	6.04
Unvested shares outstanding at March 31, 2017	874,605		$	3.61

The following table summarizes all cash performance stock unit activity for the three months ended March 31, 2017:



	Number of Shares	Weighted- Average Grant- Date Fair Value
Balance as of December 31, 2016	444,005	$	2.69
Granted	—	—
Settled	—	—
Forfeited	—	—
Cash performance stock units outstanding at March 31, 2017	444,005	$	2.69

The following table summarizes all performance stock unit activity for the three months ended March 31, 2017:



	Number of Shares		Weighted-Average Grant-Date Fair Value
Balance as of December 31, 2016	844,315		$	2.56
Granted	—		—
Settled	—		—
Forfeited	(43,166	)	6.96
Performance stock units outstanding at March 31, 2017	801,149		$	2.32

The following table summarizes all phantom stock activity for the three months ended March 31, 2017:



	Number of Shares		Weighted- Average Grant- Date Fair Value
Balance as of December 31, 2016	531,820		$	2.69
Granted	—		—
Exercised	—		—
Forfeited	(31,596	)	2.69
Phantom stock units outstanding at March 31, 2017	500,224		$	2.69