Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings per Share

Schedule of common stock equivalents excluded in the calculation of diluted loss per share

	Year Ended December 31,
	2015		2014		2013
Shares underlying Convertible Senior Secured Notes		—		—		6,219,782
Warrants to purchase common stock		—		—		13,388
Stock options, stock appreciation rights, non-vested stock options and ESPP awards		—		—		151,737

Schedule of computation of basic and diluted net income per share

The following table sets forth the computation of basic and diluted net income per share for the years ended December 31, 2015, 2014, and 2013, in thousands, except share and per share amounts:

	Year ended December 31,
	2015			2014			2013
Numerator, in thousands:
Net income (loss) used for calculation of basic EPS	$	14,016		$	19,871		$	(92,273	)
Interest expense on convertible debt		1,229			4,963			—
Changes in fair value of derivative liabilities		(589	)		(2,809	)		—
Loss on extinguishment of debt		2,338			2,592			—
Loss on extinguishment of outstanding debt, as if converted		(2,494	)		(8,315	)		—
Total adjustments		484			(3,569	)		—
Net income used for calculation of diluted EPS	$	14,500		$	16,302		$	(92,273	)
Denominator:
Weighted average shares outstanding, basic		47,485,258			42,260,896			31,848,299
Effect of dilutive potential common shares:								—
Shares underlying Convertible Senior Secured Notes		2,459,009			7,090,722
Shares issuable to settle interest make-whole derivatives		804,507			904,618			—
Warrants to purchase common stock		—			20,499			—
Stock options, stock appreciation rights, and non-vested stock options		411,606			306,776			—
Total potential dilutive common shares		3,675,122			8,322,615			—
Weighted average shares outstanding, diluted		51,160,380			50,583,511			31,848,299
Net income (loss) per share, basic	$	0.30		$	0.47		$	(2.90	)
Net income (loss) per share, diluted	$	0.28		$	0.32		$	(2.90	)