Common and Preferred Stock - Additional Information (Detail) (USD $)	1 Months Ended						10 Months Ended	12 Months Ended																		263 Months Ended				1 Months Ended		10 Months Ended	12 Months Ended																					12 Months Ended		1 Months Ended							1 Months Ended					3 Months Ended		12 Months Ended		24 Months Ended		1 Months Ended	12 Months Ended			24 Months Ended
	Dec. 31, 2012	Dec. 20, 2012	Oct. 31, 2012	Oct. 18, 2012	May 31, 2012	May 17, 2012	Dec. 31, 1994	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2007	Dec. 31, 2006	Dec. 31, 2005	Dec. 31, 2003	Dec. 31, 2002	Dec. 31, 2001	Dec. 31, 2000	Dec. 31, 1999	Dec. 31, 1998	Dec. 31, 1997	Dec. 31, 1996	Feb. 28, 1994	Feb. 28, 1993	Feb. 29, 1992	Dec. 31, 2012	Sep. 30, 2012	Jun. 27, 2012	Feb. 08, 2012	Aug. 05, 2009 Public Offering	Dec. 31, 2012 Current Asset	Dec. 31, 1994 Additional Paid-in Capital	Dec. 31, 2011 Additional Paid-in Capital	Dec. 31, 2010 Additional Paid-in Capital	Dec. 31, 2009 Additional Paid-in Capital	Dec. 31, 2007 Additional Paid-in Capital	Dec. 31, 2006 Additional Paid-in Capital	Dec. 31, 2005 Additional Paid-in Capital	Dec. 31, 2003 Additional Paid-in Capital	Dec. 31, 2002 Additional Paid-in Capital	Dec. 31, 2001 Additional Paid-in Capital	Dec. 31, 2000 Additional Paid-in Capital	Dec. 31, 1999 Additional Paid-in Capital	Dec. 31, 1998 Additional Paid-in Capital	Dec. 31, 1997 Additional Paid-in Capital	Dec. 31, 1996 Additional Paid-in Capital	Feb. 28, 1994 Additional Paid-in Capital	Feb. 28, 1993 Additional Paid-in Capital	Feb. 29, 1992 Additional Paid-in Capital	Dec. 31, 2012 Additional Paid-in Capital	Dec. 31, 2012 Other income (expense)	Oct. 31, 2012 Warrant	May 17, 2012 Other Than Equity	Dec. 31, 2012 Warrant Liability	Feb. 08, 2012 Warrant Liability	Aug. 05, 2009 Principal stockholder Public Offering	Aug. 05, 2009 Underwriters Overallotment Option Public Offering	Feb. 08, 2012 Underwriters	Feb. 08, 2012 Public	Dec. 31, 2012 Senior convertible notes due August 15 2015	Dec. 31, 2011 Senior convertible notes due August 15 2015	Aug. 18, 2010 Senior convertible notes due August 15 2015	Aug. 05, 2005 Private Placement	Oct. 31, 2012 Private Placement Warrant	Oct. 31, 2012 Private Placement Restricted Stock	Aug. 05, 2005 Private Placement Principal stockholder	Aug. 10, 2010 Seaside Eight Eight Limited Partnership	Mar. 31, 2011 Seaside Eight Eight Limited Partnership	Dec. 31, 2010 Seaside Eight Eight Limited Partnership	Mar. 31, 2011 Seaside Eight Eight Limited Partnership	Dec. 31, 2010 Seaside Eight Eight Limited Partnership	Dec. 31, 2011 Seaside Eight Eight Limited Partnership	Aug. 10, 2010 Seaside Eight Eight Limited Partnership Minimum	Aug. 10, 2010 Mann Group	Dec. 31, 2011 Mann Group	Mar. 31, 2011 Mann Group	Dec. 31, 2010 Mann Group	Dec. 31, 2011 Mann Group	Dec. 31, 2012 Mann Group	Oct. 31, 2012 Mann Group	Oct. 31, 2012 Mann Group Warrant	Dec. 31, 2012 Mann Group Forward Purchase Contracts	May 17, 2012 Mann Group Forward Purchase Contracts	Dec. 31, 2012 Mann Group Forward Purchase Contracts Equity Component	Dec. 31, 2012 Mann Group Forward Purchase Contracts Other Than Equity	May 17, 2012 Mann Group Forward Purchase Contracts Other Than Equity	Feb. 08, 2012 Related Party
Class of Stock [Line Items]
Common stock sold							$ 1,805,000		$ 9,540,000	$ 14,335,000	$ 59,724,000	$ 249,750,000	$ 384,670,000	$ 170,234,000	$ 50,000,000	$ 58,815,000	$ 78,030,000	$ 31,633,000	$ 534,000	$ 12,726,000	$ 196,000	$ 59,000	$ 526,000	$ 888,000	$ 900,000							$ 1,805,000	$ 9,526,000	$ 14,314,000	$ 59,640,000	$ 249,480,000	$ 384,440,000	$ 170,063,000	$ 49,965,000	$ 58,775,000	$ 78,000,000	$ 33,945,000	$ 532,000	$ 12,703,000	$ 190,000	$ 59,000	$ 526,000	$ 887,000	$ 890,000														$ 175,000,000			$ 87,300,000
Common stock issued and sold																														8,360,000																										1,000,000	960,000						17,132,000					1,400,000	2,100,000	1,400,000	2,100,000	3,500,000			1,400,000	1,400,000	2,100,000	3,500,000
Common stock issuable up on exercise of warrants																																																															3,426,000
Exercise price of warrants			2.60																																																				2.40								12.228
Commissions paid to the placement agents																																																															4,500,000
Other offering cost																																																															300,000
Net Proceeds from private placement of common stock																																																															170,200,000
Common stock sold price per share																																																								$ 8.11	$ 7.35
Net proceeds from issuance of common stock																										3,900,000				59,700,000																																						9,700,000	14,100,000	9,700,000	14,100,000	23,800,000			11,100,000		16,700,000	11,100,000
Common stock loaned under share lending agreement, shares	9,000,000							9,000,000	9,000,000	9,000,000																9,000,000
Principal amount																																																												100,000,000	100,000,000	100,000,000
Nominal lending fee									$ 0.01
Common stock sold in increments																																																																			18,200,000
Increments of shares																																																																			700,000
Weighted average trading price																																																																									$ 6.50
Trading period volume																																																																			10 days
Percentage of purchase price																																																																			92.00%
Closing bid price of common stock																																																																										$ 7.15
Reduction of principal on note payable to related party upon issuance of common stock								184,537,000	11,116,000	16,681,000																212,334,000																																																350,000,000		27,800,000
Number of Unit Sold in an Underwritten public offering																													35,937,500																													4,687,500
Units sold composition description																													Each unit consisting of one share of common stock and a warrant to purchase 0.6 of a share of common stock																																																										Each unit consisting of one share of common stock and a warrant to purchase 0.6 of a share of common stock
Warrant to purchase of a share of common stock																													0.6
Combined purchased price common stock																																																				2.00						2.256	2.40
Net proceeds from offering								80,600,000
Number of warrants are exercisable																																																							21,562,500
Duration for Expiration of warrants																																																						4 years
Capital stock authorized	286,035,082							286,035,082	131,522,945																	286,035,082		31,250,000																																																			31,250,000
Restricted common stock price per share																																																																															$ 2.47
Restricted Stock Agreed to be Purchased by Lender																													77,200,000																																																		107,400,000	107,400,000
Number of Shares that recorded the portion of the derivative instrument representing equity																																																																																				14,700,000
Number of Shares that recorded the portion of the derivative instrument representing outside of equity	16,500,000							16,500,000																		16,500,000
Fair value of the forward purchase contract																																																																																		2,000,000		900,000	1,100,000
Authorized shares under common stock purchase agreement	350,000,000				250,000,000	250,000,000
Common stock, shares authorized	550,000,000				350,000,000	350,000,000		550,000,000	250,000,000																	550,000,000
Fair value of Non-Equity Portion																																																					13,100,000
Change in fair value recognized in other income	12,000,000							12,000,000																		12,000,000
Valuation of non-equity portion of forward contract	$ 2.40					$ 1.69		$ 2.40																		$ 2.40
Risk Free Interest Rate																											0.10%																										0.18%																																	0.08%
Discount for lack of marketability						0.42%																																																																													2.57%
Underwritten public offering			40,000,000																																																													40,000,000	40,000,000
Common Stock Purchase			30,000,000
Additional common stock shares issued			6,000,000
Additional Purchase Of Common Stock			4,500,000
Net proceeds from public offering			86,300,000
Warrant entitles the holder to purchase a share of common stock			0.75
Warrant expiration date			2013-10
Selling price of restricted shares																																																																																$ 2.59
Restricted warrants sale price																																																																																	$ 0.125
Amended and restated promissory note outstanding principal amount																																																																																350,000,000
Fair value of forward contract																															$ 28,200,000																			$ 15,000,000	$ 13,200,000
Fair value assumption risk free rate		0.00%		0.11%
Fair value input discount rate		1.50%		2.30%
Common stock, par value	$ 0.01							$ 0.01	$ 0.01																	$ 0.01
Undesignated preferred stock, shares authorized	10,000,000							10,000,000	10,000,000																	10,000,000
Undesignated preferred stock, par value	$ 0.01							$ 0.01	$ 0.01																	$ 0.01
Common stock, shares issued	286,035,082							286,035,082	131,522,945																	286,035,082