Equity and Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Equity and Share-Based Compensation

Summary of changes in the number of shares of common stock and treasury stock

	Common Stock	Treasury Stock(1)
Share count as of December 31, 2017	25,272,969	(99,623	)
Common stock issued	110,885	—
Acquisition of treasury stock	—	(28,746	)
Share count as of March 31, 2018	25,383,854	(128,369	)

(1) Treasury stock represents the net settlement on vesting of restricted stock necessary to satisfy the minimum statutory tax withholding requirements.

Summary of non-vested restricted stock unit award activity

	Restricted Stock		Weighted Average Grant Date Fair Value
Non-vested shares outstanding at December 31, 2017	324,984		$	18.84
Granted	269,468		$	14.25
Vested(1)	(102,759	)	$	19.66
Forfeited	—		$	—
Non-vested shares outstanding at March 31, 2018	491,693		$	16.16

(1) Vested restricted stock units include 102,092 shares in which vesting was accelerated as a result of a reduction in workforce that occurred during the three months ended March 31, 2018.

Summary of non-vested stock option activity

	Options		Range of Exercise Prices		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)
Stock options outstanding at December 31, 2017	245,845				$	19.66	8.6
Granted	—		$	—	$	—	—
Vested(1)	(102,759	)	$	19.08-19.66	$	19.66	0.4
Forfeited	—		$	—	$	—	—
Stock options outstanding at March 31, 2018	143,086				$	19.66	8.6
Vested and exercisable at end of period(2)	356,437		$	19.08-20.97	$	19.66	6.7

(1) Vested stock options include 102,092 options in which vesting was accelerated as a result of a reduction in workforce that occurred during the three months ended March 31, 2018.

(2) Vested and exercisable options at March 31, 2018, had no aggregate intrinsic value.

Schedule of executive officer restricted stock units containing a market condition with respect to RSUs granted

	Relative TSR for the Performance Period	Vesting as % of RSUs Granted
Maximum	Top 35% or better Relative TSR to Peer Group	150	%
Target	Top 50% or better Relative TSR to Peer Group	100	%
Threshold	Top 60% or better Relative TSR to Peer Group	50	%
Below Threshold	Less than 60% of Relative TSR to Peer Group	0	%

Schedule of executive officer restricted stock units with market condition valuation assumptions

	Awards Issued March 1, 2018
Risk-free interest rate (1)	2.34%
Dividend yield	—
Expected volatility	40.0% - 127.2%
Calculated fair value per unit	$ 13.34

(1) U.S. Treasury yields as of the grant date were utilized for the risk-free interest rate assumption, matching the treasury yield terms to the life of the executives restricted stock unit award with a market condition.

Schedule of executive officer restricted stock units with market condition award activity

	Shares	Weighted Average Fair Value
Outstanding at December 31, 2017	—	$	—
Granted	96,305	$	13.34
Vested	—	$	—
Forfeited	—	$	—
Outstanding at March 31, 2018	96,305	$	13.34