Net Loss Per Common Share - Diluted Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Computation of basic and diluted net loss per share [Abstract]
Net loss available to common stockholders	$ (3,276)	$ (8,466)	$ (13,126)	$ (13,287)
Dividends on Series B Convertible Preferred Stock	$ 1,497	$ 0	$ 2,965	$ 0
Weighted average shares outstanding (in shares)	110,276,636	108,119,461	109,841,428	108,081,625
Weighted average shares outstanding adjusted for potential common shares	110,276,636	108,119,461	109,841,428	108,081,625
Diluted net (loss) income per common share (in dollars per share)	$ (0.03)	$ (0.08)	$ (0.12)	$ (0.12)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	30,373,856	1,635,618	30,232,150	2,117,833
Net loss available to common stockholders	$ (3,276)	$ (8,466)	$ (13,126)	$ (13,287)
Dividends on Series B Convertible Preferred Stock	$ 1,497	$ 0	$ 2,965	$ 0
Net loss per common share - diluted (in dollars per share)	$ (0.03)	$ (0.08)	$ (0.12)	$ (0.12)
Weighted average common shares outstanding - basic (in shares)	110,276,636	108,119,461	109,841,428	108,081,625
Weighted average common shares outstanding - diluted (in shares)	110,276,636	108,119,461	109,841,428	108,081,625
Series B Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	26,758,916	0	26,497,570	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)	1,271,626	1,044,479	1,450,671	1,386,674
Restricted stock unit awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,471,412	0	1,345,953	0
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)	838,644	562,513	906,811	714,600
Performance stock unit awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	33,258	28,626	31,145	16,559