Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator, in thousands:
Net income used for calculation of basic EPS	$ 4,825	$ 738
Interest expense on convertible debt	179
Changes in fair value of derivative liabilities	(101)
Loss on extinguishment of debt	382
Loss on extinguishment of outstanding debt, as if converted	(1,229)
Total adjustments	(769)
Net income used for calculation of diluted EPS	$ 4,056	$ 738
Denominator:
Weighted average shares outstanding, basic	49,240,099	44,563,299
Effect of dilutive potential common shares:
Shares underlying Convertible Senior Secured Notes	1,383,472
Shares issuable to settle interest make-whole derivatives	71,537
Stock options, stock appreciation rights, and non-vested stock options	456,964	337,999
Total potential dilutive common shares	1,911,973	337,999
Weighted average shares outstanding, diluted	51,152,072	44,901,298
Net income per share, basic	$ 0.10	$ 0.02
Net income per share, diluted	$ 0.08	$ 0.02
Convertible Notes Payable [Member]
Loss Per Share
Common stock equivalents excluded in the calculation of diluted loss per share		6,071,894
Warrant [Member]
Loss Per Share
Common stock equivalents excluded in the calculation of diluted loss per share		21,800