Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock Series B	Preferred Stock Series E	Common Stock	Additional Paid-In Capital [Member]	Accum Deficit [Member]
Balances, shares, beginning balance at Dec. 31, 2013		44,000	28,000	7,299,000
Balances, beginning balance at Dec. 31, 2013	$ (9,775)	$ 0	$ 1	$ 73	$ 159,319	$ (169,167)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Declared and paid dividends on preferred stock, shares				(6,000)
Declared and paid dividends on preferred stock	0				218	(218)
Common stock issued from exercise of rights offering, shares				428,000
Common stock issued from exercise of rights offering	13,368			$ 4	13,364
Stock issuance, shares				27,000
Stock issuance	$ (188)				(188)
Options exercised, shares	153,600			141,000
Options exercised	$ 2,770			$ 2	2,768
Stock-based compensation	636				636
Net loss	(23,912)					(23,912)
Balances, shares, endings balance at Dec. 31, 2014		44,000	28,000	7,901,000
Balances, ending balance at Dec. 31, 2014	(17,101)	$ 0	$ 1	$ 79	176,117	(193,297)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Declared and paid dividends on preferred stock, shares				(5,000)
Declared and paid dividends on preferred stock	(1)				159	(160)
Redemption of Series E Preferred Shares, shares			(28,000)
Redemption of Series E Preferred Shares	534		$ 1		533
Common stock issued from exercise of rights offering, shares				1,409,000
Common stock issued from exercise of rights offering	49,528			$ 14	49,514
Stock issuance, shares				123,000
Stock issuance	$ 1			$ 1
Options exercised, shares	81,600			40,000
Options exercised	$ 162			$ 1	160
Stock-based compensation	596				596
Warrants exercised, shares				83,000
Warrants exercised	2,500			$ 1	2,499
Net loss	(36,610)					(36,610)
Balances, shares, endings balance at Dec. 31, 2015		44,000	0	9,561,000
Balances, ending balance at Dec. 31, 2015	(1,459)	$ 0	$ 0	$ 96	228,512	(230,067)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Declared and paid dividends on preferred stock	(295)					(295)
Redemption of Series E Preferred Shares, shares				(1,332,000)
Redemption of Series E Preferred Shares	17,426			$ 14	17,412
Common stock issued from exercise of rights offering, shares				20,139,000
Common stock issued from exercise of rights offering	$ 286,003			$ 201	285,802
Options exercised, shares	18,000
Stock-based compensation	$ 2,122				2,122
Stockholders' Equity, Other Shares				124,000
Stockholders' Equity, Other	(34)			$ 1	(35)
Net loss	(24,197)					(24,197)
Balances, shares, endings balance at Dec. 31, 2016		44,000	0	31,156,000
Balances, ending balance at Dec. 31, 2016	$ 279,566	$ 0	$ 0	$ 312	$ 533,813	$ (254,559)