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Preferred Stock, Common Stock and Warrants - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended
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Oct. 31, 2013 | May 09, 2012 | Nov. 03, 2011 | Nov. 02, 2010 | Apr. 30, 2010 | Apr. 16, 2010 | Nov. 30, 2009 | Nov. 04, 2008 | Apr. 18, 2006 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | May 29, 2013 | Dec. 31, 2013 SDI | Dec. 31, 2013 2007 Loan Agreement | Oct. 31, 2013 Common Stock | Dec. 31, 2013 Common Stock | Nov. 04, 2008 Minimum | Oct. 31, 2013 Series B Convertible Preferred Stock | Dec. 31, 2013 Series B Convertible Preferred Stock | Dec. 31, 2012 Series B Convertible Preferred Stock | Mar. 29, 2013 MLV Maximum | Sep. 30, 2010 Aspire Capital Fund Llc | Sep. 20, 2010 Aspire Capital Fund Llc | Dec. 31, 2011 Aspire Capital Fund Llc | Dec. 31, 2010 Aspire Capital Fund Llc | Sep. 20, 2010 Aspire Capital Fund Llc Maximum
Preferred Stock Common Stock And Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  |  |  | 350,000,000 | 250,000,000 |  | 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  |  | 5,000,000 | 5,000,000 |  |  |  |  |  |  |  |  | 43,000 | 0 |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Stock issued during period, shares | 79,570,000 | 17,500,000 | 27,600,000 | 26,450,000 | 1,076,420 | 30,293,000 |  |  |  |  |  |  |  |  |  |  | 79,570,000 |  | 43,430 |  |  |  |  |  | 10,995,210 | 2,350,000 |
Preferred stock, par value |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |
Public offering net price per share | $ 1.075 | $ 4.25 | $ 2.50 | $ 1.70 |  | $ 1.4525 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,075 |  |  |  |  |  |  |  |
Gross proceeds from issuance of stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,500,000 |  |  | $ 46,700,000 |  |  |  |  |  |  |  |
Issuance costs |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  | 4,500,000 |  |  | 2,500,000 |  |  |  |  |  |  |  |
Net proceeds from offering |  | 69,600,000 | 64,500,000 | 42,000,000 |  | 41,100,000 |  |  |  |  |  |  |  |  |  | 80,900,000 |  |  | 44,200,000 |  |  |  |  |  |  |  |
Convertible common stock shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |
Convertible preferred stock, terms of conversion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The holder is prohibited from converting the Series B Convertible Preferred Stock into shares of common stock if, as a result of such conversion, the holder and its affiliates would own more than 9.98% of the total number of shares of common stock then issued and outstanding. |  |  |  |  |  |  |
Convertible preferred stock, settlement terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | In the event of the Company’s liquidation, dissolution, or winding up, holders of Series B Convertible Preferred Stock will receive a payment equal to $0.001 per share before any proceeds are distributed to the common stockholders. |  |  |  |  |  |  |
Convertible common stock exceeded allocated purchase price of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,500,000 |  |  |  |  |  |  |
Common stock, par value |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable date |  |  |  |  |  |  |  | Nov. 17, 2008 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares price |  |  |  |  |  |  |  | $ 6.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |
Percentage of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Rights expiration date |  |  |  |  |  |  |  | Nov. 17, 2008 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock aggregate offering price |  |  |  |  |  |  |  |  |  | 80,999,000 |  |  |  |  |  |  | 80,000 |  |  |  |  | 50,000,000 |  |  |  |  |
Commission on gross sales proceeds of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |
Sale of stock pursuant to exercise of underwriters overallotment option |  |  | 3,600,000 | 3,450,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to purchase shares value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000
Purchase agreement term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 months |  |  |
Percentage of commitment to purchase shares value as commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |
Commitment fee paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |
Issuance of shares of common stock for commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |
Proceeds from issuances of common stock |  |  |  |  |  |  |  |  |  | $ 80,856,000 | $ 71,780,000 | $ 91,298,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,700,000 | $ 3,300,000 |
Number of shares of common stock in each unit |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants in each unit |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share per warrant |  |  |  |  |  | 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercise price |  |  |  |  | 1.50 | 1.50 | 1.94 |  | 7.32 | 1.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercisable period |  |  |  |  | 5 years | 5 years | 5 years |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  |  |  |  |  | 10,913,873 |  |  |  | 6,765,128 | 1,550,000 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of warrants for common shares to be purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,550,000 |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase common stock |  |  |  |  |  |  |  |  |  | 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Warrants Exercised During Period |  |  |  |  |  |  |  |  |  | 250,000 | 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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