Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares)	71,853	(115)
Balance	$ 719	$ (259)	$ 611,279	$ (507,766)	$ 2,052	$ 106,025
Issuance of common stock in public offering, net of expenses (in shares)	10,704
Issuance of common stock in public offering, net of expenses	$ 107		19,568			19,675
Stock options exercised (in shares)	70
Stock options exercised			132			132
Shares issued under employee stock purchase plan (in shares)	271
Shares issued under employee stock purchase plan	$ 3		442			445
Restricted stock activity, net of forfeitures (in shares)	1,539
Restricted stock activity, net of forfeitures	$ 15		(15)
Amortization of stock-based compensation			6,516			6,516
Other comprehensive income					(405)	(405)
Net loss				(53,979)		(53,979)
Balance (in shares)	84,437	(115)
Balance	$ 844	$ (259)	637,922	(561,745)	$ 1,647	78,409
Stock options exercised (in shares)	5
Stock options exercised			10			10
Shares issued under employee stock purchase plan (in shares)	158
Shares issued under employee stock purchase plan	$ 2		102			104
Restricted stock activity, net of forfeitures (in shares)	2,278
Restricted stock activity, net of forfeitures	$ 23		(23)
Amortization of stock-based compensation			4,672			4,672
Other comprehensive income					$ (1,647)	(1,647)
Net loss				(38,890)		(38,890)
Balance (in shares)	86,878	(115)
Balance	$ 869	$ (259)	642,683	(600,635)		42,658
Shares issued under employee stock purchase plan (in shares)	140
Shares issued under employee stock purchase plan	$ 1		73			74
Restricted stock activity, net of forfeitures (in shares)	2,781
Restricted stock activity, net of forfeitures	$ 28		(28)
Amortization of stock-based compensation			3,208			3,208
Net loss				(23,490)		(23,490)
Treasury share purchase (in shares)		(8)
Treasury share purchase		$ (3)				(3)
Balance (in shares)	89,799	(123)
Balance	$ 898	$ (262)	$ 645,936	$ (624,125)		$ 22,447