Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Computation of basic and diluted net loss per share [Abstract]
Net (loss) income	$ (13,273)	$ 4,619
Denominator for basic earnings per share - weighted average shares (in shares)	106,420,317	104,747,411
Effect of dilutive securities: Stock options, restricted stock, and warrants outstanding (in shares)	803,487	8,961,976
Denominator for diluted earnings per share - weighted average shares adjusted for dilutive securities (in shares)	106,420,317	113,709,387
(Loss) income per common share - basic (in dollars per share)	$ (0.12)	$ 0.04
(Loss) income per common share - diluted (in dollars per share)	$ (0.12)	$ 0.04
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	803,487	8,961,976
Outstanding Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	609,292	6,856,369
Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	194,195	2,105,607

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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