Consolidated Statement of Stockholders' Equity, Series A and Series B Convertible Preferred Stock (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Treasury Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member]	Series A Convertible Preferred Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Series A Convertible Preferred Stock [Member]	Series B Convertible Preferred Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Series B Convertible Preferred Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Total
Balance (in shares) at Dec. 31, 2018		106,856		6
Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018	$ 0		$ 0		$ 0		$ (213)		$ 0		$ 0		$ (213)
Balance (Accounting Standards Update 2018-07 [Member]) at Dec. 31, 2018	$ 0		$ 0		$ 2,116		$ 0		$ 0		$ 0		$ 2,116
Balance at Dec. 31, 2018		$ 11		$ (35)		$ 180,862		$ (97,617)		$ 40,091		$ 26,159		$ 83,221
Share-based compensation		$ 0		$ 0		(11,738)		0		0		0		(11,738)
Restricted stock vesting (in shares)		498		0
Restricted stock vesting		$ 0		$ 0		495		0		0		0		495
Shares repurchased related to share-based compensation (in shares)		(131)		131
Shares repurchased related to share-based compensation		$ 0		$ (650)		0		0		0		0		(650)
Preferred stock dividends		0		0		(7,821)		0		4,771		3,020		(7,821)
Deemed dividends - accretion of beneficial conversion feature		0		0		(1,324)		0		1,324		0		(1,324)
Net income (loss)		$ 0		$ 0		0		(21,990)		0		0		(21,990)
Issuance of Series B Convertible Preferred Stock (in shares)		0		0
Issuance of Series B Convertible Preferred Stock		$ 0		$ 0		0		0		0		19,009		0
Balance (in shares) at Sep. 30, 2019		107,223		137
Balance at Sep. 30, 2019		$ 11		$ (685)		162,590		(119,820)		46,186		48,188		42,096
Balance (in shares) at Jun. 30, 2019		107,169		103
Balance at Jun. 30, 2019		$ 11		$ (466)		170,374		(116,592)		44,263		46,987		53,327
Share-based compensation		$ 0		$ 0		(4,648)		0		0		0		(4,648)
Restricted stock vesting (in shares)		88		0
Restricted stock vesting		$ 0		$ 0		0		0		0		0		0
Shares repurchased related to share-based compensation (in shares)		(34)		34
Shares repurchased related to share-based compensation		$ 0		$ (219)		0		0		0		0		(219)
Preferred stock dividends		0		0		(2,850)		0		1,637		1,201		(2,850)
Deemed dividends - accretion of beneficial conversion feature		0		0		(286)		0		286		0		(286)
Net income (loss)		$ 0		$ 0		0		(3,228)		0		0		(3,228)
Balance (in shares) at Sep. 30, 2019		107,223		137
Balance at Sep. 30, 2019		$ 11		$ (685)		162,590		(119,820)		46,186		48,188		42,096
Balance (in shares) at Dec. 31, 2019		117,329		137
Balance at Dec. 31, 2019		$ 12		$ (685)		224,091		(133,701)		48,084		49,814		89,717
Share-based compensation		$ 0		$ 0		(606)		0		0		0		(606)
Restricted stock vesting (in shares)		496		0
Restricted stock vesting		$ 0		$ 0		0		0		0		0		0
Shares repurchased related to share-based compensation (in shares)		(105)		105
Shares repurchased related to share-based compensation		$ 0		$ (322)		0		0		0		0		(322)
Preferred stock dividends		0		0		(10,565)		0		5,389		5,135		(10,565)
Deemed dividends - accretion of beneficial conversion feature		0		0		(113)		0		113		0		(113)
Net income (loss)		$ 0		$ 0		0		(12,050)		0		0		(12,050)
Balance (in shares) at Sep. 30, 2020		117,720		242
Balance at Sep. 30, 2020		$ 12		$ (1,007)		212,807		(145,751)		53,586		54,949		66,061
Balance (in shares) at Jun. 30, 2020		117,492		178
Balance at Jun. 30, 2020		$ 12		$ (796)		215,807		(138,573)		51,727		53,192		76,450
Share-based compensation		$ 0		$ 0		629		0		0		0		629
Restricted stock vesting (in shares)		292		0
Restricted stock vesting		$ 0		$ 0		0		0		0		0		0
Shares repurchased related to share-based compensation (in shares)		(64)		64
Shares repurchased related to share-based compensation		$ 0		$ (211)		0		0		0		0		(211)
Preferred stock dividends		0		0		(3,613)		0		1,843		1,757		(3,613)
Deemed dividends - accretion of beneficial conversion feature		0		0		(16)		0		16		0		(16)
Net income (loss)		$ 0		$ 0		0		(7,178)		0		0		(7,178)
Balance (in shares) at Sep. 30, 2020		117,720		242
Balance at Sep. 30, 2020		$ 12		$ (1,007)		$ 212,807		$ (145,751)		$ 53,586		$ 54,949		$ 66,061