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]	AOCI Attributable to Parent [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	AOCI Attributable to Parent [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		$ 0		$ (213)
Balance (Accounting Standards Update 2018-07 [Member]) at Dec. 31, 2018	$ 0		$ 0		$ 2,116		$ 0		$ 0		$ 0		$ 0		$ 2,116
Balance at Dec. 31, 2018		$ 11		$ (35)		$ 180,862		$ (97,617)		$ 0		$ 40,091		$ 26,159		$ 83,221
Share-based compensation		$ 0		$ 0		(7,088)		0		0		0		0		(7,088)
Restricted stock vesting (in shares)		410		0
Restricted stock vesting		$ 0		$ 0		495		0		0		0		0		495
Shares repurchased related to share-based compensation (in shares)		(97)		97
Shares repurchased related to share-based compensation		$ 0		$ (431)		0		0		0		0		0		(431)
Preferred stock dividends		0		0		(4,972)		0		0		3,133		1,819		(4,972)
Deemed dividends - accretion of beneficial conversion feature		0		0		(1,039)		0		0		1,039		0		(1,039)
Net income (loss)		$ 0		$ 0		0		(18,672)		0		0		0		(18,762)
Issuance of Series B Convertible Preferred Stock (in shares)		0		0
Issuance of Series B Convertible Preferred Stock		$ 0		$ 0		0		0		0		0		19,009		0
Balance (in shares) at Jun. 30, 2019		107,169		103
Balance at Jun. 30, 2019		$ 11		$ (466)		170,374		(116,592)		0		44,263		46,987		53,327
Balance (in shares) at Mar. 31, 2019		106,971		71
Balance at Mar. 31, 2019		$ 11		$ (295)		183,834		109,873		0		43,775		27,978		73,677
Share-based compensation		$ 0		$ 0		(12,972)		0		0		0		0		(12,972)
Restricted stock vesting (in shares)		230		0
Restricted stock vesting		$ 0		$ 0		0		0		0		0		0		0
Shares repurchased related to share-based compensation (in shares)		(32)		32
Shares repurchased related to share-based compensation		$ 0		$ (171)		0		0		0		0		0		(171)
Preferred stock dividends		0		0		0		0		0		0		19,009		0
Deemed dividends - accretion of beneficial conversion feature		0		0		(488)		0		0		488		0		(488)
Net income (loss)		$ 0		$ 0		0		(6,719)		0		0		0		(6,719)
Balance (in shares) at Jun. 30, 2019		107,169		103
Balance at Jun. 30, 2019		$ 11		$ (466)		170,374		(116,592)		$ 0		44,263		46,987		53,327
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		(1,235)		0				0		0		(1,235)
Restricted stock vesting (in shares)		204		0
Restricted stock vesting		$ 0		$ 0		0		0				0		0		0
Shares repurchased related to share-based compensation (in shares)		(41)		41
Shares repurchased related to share-based compensation		$ 0		$ (111)		0		0				0		0		(111)
Preferred stock dividends		0		0		(6,952)		0				3,546		3,378		(6,952)
Deemed dividends - accretion of beneficial conversion feature		0		0		(97)		0				97		0		(97)
Net income (loss)		$ 0		$ 0		0		(4,872)				0		0		(4,872)
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
Balance (in shares) at Mar. 31, 2020		117,388		148
Balance at Mar. 31, 2020		$ 12		$ (742)		218,972		(132,799)				49,917		51,487		85,443
Share-based compensation		$ 0		$ 0		365		0				0		0		365
Restricted stock vesting (in shares)		134		0
Restricted stock vesting		$ 0		$ 0		0		0				0		0		0
Shares repurchased related to share-based compensation (in shares)		(30)		30
Shares repurchased related to share-based compensation		$ 0		$ (54)		0		0				0		0		(54)
Preferred stock dividends		0		0		(3,509)		0				1,789		1,705		(3,509)
Deemed dividends - accretion of beneficial conversion feature		0		0		(21)		0				21		0		(21)
Net income (loss)		$ 0		$ 0		0		(5,774)				0		0		(5,774)
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