Consolidated Statements Of Stockholders' Equity/(Deficit) - USD ($) $ in Thousands	Total	Preferred Stock Series B	Preferred Stock Series E	Common Stock	Additional paid-in capital	Other Comprehensive Loss	Accumulated deficit
Balances, shares, beginning balance at Dec. 31, 2014		44,000	28,000	7,901,000
Balances, beginning balance at Dec. 31, 2014	$ (17,101)	$ 0	$ 1	$ 79	$ 176,117	$ 0	$ (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)
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	0
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Exercises in Period				40,000
Options exercised, shares	81,600
Options exercised	$ 2,500			$ 1	2,499
Stock-based compensation	596				596
Warrants exercised, shares				83,000
Restricted stock forfeited for tax payment	162			$ 1	160
Kien Huat note conversion, shares				1,380,000
Kien Huat note conversion	35,889			$ 14	35,875
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	0	(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	0	(254,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Declared and paid dividends on preferred stock	$ (129)						(129)
Options exercised, shares	2,000			2,000
Options exercised	$ 16			$ 0	16
Stock-based compensation	2,155				2,155
Stockholders' Equity, Other Shares				34,000
Stockholders' Equity, Other	758			$ 0	758
Warrants exercised, shares				(12,000)
Restricted stock forfeited for tax payment	(275)			$ 0	(275)
Comprehensive loss	(315)					(315)
Net loss	(46,344)						(46,344)
Balances, shares, endings balance at Dec. 31, 2017		44,000	0	32,560,000
Balances, ending balance at Dec. 31, 2017	$ 271,321	$ 0	$ 0	$ 326	$ 572,342	$ (315)	$ (301,032)