Consolidated Statement of Stockholders' Equity, Series A and Series B Convertible Preferred Stock (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Series A Preferred Stock [Member] Common Stock [Member]	Series A Preferred Stock [Member] Treasury Stock [Member]	Series A Preferred Stock [Member] Additional Paid-in Capital [Member]	Series A Preferred Stock [Member] Retained Earnings [Member]	Series A Preferred Stock [Member] AOCI Attributable to Parent [Member]	Series A Preferred Stock [Member] Series A Convertible Preferred Stock [Member]	Series A Preferred Stock [Member] Series B Convertible Preferred Stock [Member]	Series A Preferred Stock [Member]	Series B Preferred Stock [Member] Common Stock [Member]	Series B Preferred Stock [Member] Treasury Stock [Member]	Series B Preferred Stock [Member] Additional Paid-in Capital [Member]	Series B Preferred Stock [Member] Retained Earnings [Member]	Series B Preferred Stock [Member] AOCI Attributable to Parent [Member]	Series B Preferred Stock [Member] Series A Convertible Preferred Stock [Member]	Series B Preferred Stock [Member] Series B Convertible Preferred Stock [Member]	Series B Preferred Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Series A Convertible Preferred Stock [Member]	Series B Convertible Preferred Stock [Member]	Total
Balance (in shares) at Dec. 31, 2017																	106,275
Balance at Dec. 31, 2017																	$ 11		$ 158,738	$ (55,617)	$ (40)			$ 103,092
Share-based compensation																								13,169
Restricted stock vesting (in shares)																	136
Restricted stock vesting
Shares repurchased related to share-based compensation (in shares)																	(3)
Shares repurchased related to share-based compensation																		$ (19)						(19)
Shares repurchased related to share-based compensation (in shares)																		3
Deemed dividends - accretion of beneficial conversion feature																			(271)			271		(271)
Net loss																				(30,362)				(30,362)
Issuance of preferred stock			$ 4,638			$ 38,549		$ 4,638							$ 26,159
Share-based compensation																			13,169					13,169
Issuance of preferred stock (in shares)	414
Adoption of ASU 2016-01																				(40)	40
Balance (in shares) at Sep. 30, 2018																	106,822	3
Balance at Sep. 30, 2018																	$ 11	$ (19)	176,274	(86,019)		38,820	26,159	90,247
Balance (in shares) at Jun. 30, 2018																	106,398
Balance at Jun. 30, 2018																	$ 11		169,454	(75,339)				94,126
Share-based compensation																								2,451
Restricted stock vesting (in shares)																	13
Restricted stock vesting
Shares repurchased related to share-based compensation (in shares)																	(3)
Shares repurchased related to share-based compensation																		$ (19)						(19)
Shares repurchased related to share-based compensation (in shares)																		3
Deemed dividends - accretion of beneficial conversion feature																			(271)			271		(271)
Net loss																				(10,680)				(10,680)
Issuance of preferred stock			$ 4,638			$ 38,549		$ 4,638							$ 26,159
Share-based compensation																			2,453					2,453
Issuance of preferred stock (in shares)	414
Balance (in shares) at Sep. 30, 2018																	106,822	3
Balance at Sep. 30, 2018																	$ 11	$ (19)	176,274	(86,019)		38,820	26,159	90,247
Balance (in shares) at Dec. 31, 2018																	106,856	6
Balance at Dec. 31, 2018																	$ 11	$ (35)	180,862	(97,617)		40,091	26,159	83,221
Share-based compensation																			(11,738)					(11,738)
Restricted stock vesting (in shares)																	498
Restricted stock vesting																			495					495
Shares repurchased related to share-based compensation (in shares)																	(131)
Shares repurchased related to share-based compensation																		$ (650)						(650)
Shares repurchased related to share-based compensation (in shares)																		131
Preferred stock dividends																			(7,821)			4,771	3,020	(7,821)
Deemed dividends - accretion of beneficial conversion feature																			(1,324)			1,324		(1,324)
Net loss																				(21,990)				(21,990)
Adoption of new accounting policy (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018																				(213)				(213)
Adoption of new accounting policy (Accounting Standards Update 2018-07 [Member]) at Dec. 31, 2018																			2,116					2,116
Issuance of preferred stock																							19,009
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																			(4,648)					(4,648)
Restricted stock vesting (in shares)																	88
Restricted stock vesting
Shares repurchased related to share-based compensation (in shares)																	(34)
Shares repurchased related to share-based compensation																		$ (219)						(219)
Shares repurchased related to share-based compensation (in shares)																		34
Preferred stock dividends																			(2,850)			1,637	1,201	(2,850)
Deemed dividends - accretion of beneficial conversion feature																			(286)			286		(286)
Net loss																				(3,228)				(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