Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Computation of basic and diluted net loss per share [Abstract]
Net loss	$ (8,466)	$ (17,210)	$ (13,287)	$ (30,483)
Denominator for basic earnings per share - weighted average shares (in shares)	108,119,461	106,942,429	108,081,625	106,885,893
Effect of dilutive securities: Stock options and restricted stock outstanding (in shares)	1,635,618	1,611,959	2,117,833	1,203,886
Denominator for diluted earnings per share - weighted average shares adjusted for dilutive securities (in shares)	108,119,461	106,942,429	108,081,625	106,885,893
Loss per common share - basic (in dollars per share)	$ (0.08)	$ (0.16)	$ (0.12)	$ (0.29)
Loss per common share - diluted (in dollars per share)	$ (0.08)	$ (0.16)	$ (0.12)	$ (0.29)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,635,618	1,611,959	2,117,833	1,203,886
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)	562,513	878,134	714,600	792,760
Performance Based Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	28,626	0	16,559	0
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)	1,044,479	733,825	1,386,674	411,126

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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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