CONSOLDATED STATEMENTS OF STOCKHOLDERS' DEFICIT Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]
Balances at beginning of period at Dec. 31, 2017	$ (268,570)	$ 423	$ 1,035,808	$ (1,284,703)	$ (17,672)	$ (2,426)
Balances at beginning of period (in shares) at Dec. 31, 2017		42,339			(983)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(699)	$ 0	(11,655)	0	$ 10,956	0
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		0			474
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	4,331		4,331
Net Income (Loss) Attributable to Parent	(16,577)			(16,577)
Other Comprehensive Income (Loss), Net of Tax	(970)					(970)
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments	(23)		(23)
Capped Call Transaction Cost Reimbursement	6		6
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	108,367			108,367
Balances at end of period at Sep. 30, 2018	(174,135)	$ 423	1,028,467	(1,192,913)	$ (6,716)	(3,396)
Balances at end of period (in shares) at Sep. 30, 2018		42,339			(509)
Balances at beginning of period at Jun. 30, 2018	(176,874)	$ 423	1,028,334	(1,193,791)	$ (8,358)	(3,482)
Balances at beginning of period (in shares) at Jun. 30, 2018		42,339			(617)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(304)	$ 0	(1,946)	0	$ 1,642	0
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		0			108
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	2,076		2,076
Net Income (Loss) Attributable to Parent	878			878
Other Comprehensive Income (Loss), Net of Tax	86					86
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments	(1)		(1)
Capped Call Transaction Cost Reimbursement	4		4
Balances at end of period at Sep. 30, 2018	(174,135)	$ 423	1,028,467	(1,192,913)	$ (6,716)	(3,396)
Balances at end of period (in shares) at Sep. 30, 2018		42,339			(509)
Balances at beginning of period at Dec. 31, 2018	(166,661)	$ 423	1,028,924	(1,187,010)	$ (5,231)	(3,767)
Balances at beginning of period (in shares) at Dec. 31, 2018		42,339			(391)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(3,129)	$ 6	(8,366)	0	$ 5,231	0
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		668			391
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	5,788		5,788
Net Income (Loss) Attributable to Parent	(7,771)			(7,771)
Other Comprehensive Income (Loss), Net of Tax	(602)					(602)
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments	(577)		(577)
Capped Call Transaction Cost Reimbursement	27		27
Balances at end of period at Sep. 30, 2019	(172,925)	$ 429	1,025,796	(1,194,781)	$ 0	(4,369)
Balances at end of period (in shares) at Sep. 30, 2019		43,007			0
Balances at beginning of period at Jun. 30, 2019	(175,823)	$ 427	1,025,301	(1,197,946)	$ 0	(3,605)
Balances at beginning of period (in shares) at Jun. 30, 2019		42,720			0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(1,548)	$ 2	(1,550)	0	$ 0	0
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		287			0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	2,045		2,045
Net Income (Loss) Attributable to Parent	3,165			3,165
Other Comprehensive Income (Loss), Net of Tax	(764)					(764)
Balances at end of period at Sep. 30, 2019	$ (172,925)	$ 429	$ 1,025,796	$ (1,194,781)	$ 0	$ (4,369)
Balances at end of period (in shares) at Sep. 30, 2019		43,007			0