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Financing Agreements - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |
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May 09, 2012 | Nov. 03, 2011 | Nov. 02, 2010 | Apr. 30, 2010 | Apr. 16, 2010 | Nov. 30, 2009 | Apr. 18, 2006 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2012 | Dec. 31, 2012 SDI | Aug. 17, 2009 Maximum | Dec. 31, 2012 2007 Loan Agreement | Dec. 31, 2012 2007 Loan Agreement 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
Other Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares | 17,500,000 | 27,600,000 | 26,450,000 | 1,076,420 |  |  |  | 900,860 | 1,281,100 |  |  |  |  |  |  |  | 10,995,210 | 2,350,000 |
Public offering net price per share | $ 4.25 | $ 2.50 | $ 1.70 |  | $ 1.4525 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from offering | $ 69.6 | $ 64.5 | $ 42.0 |  | $ 41.1 |  |  | $ 1.2 | $ 2.3 |  |  |  |  |  |  |  |  |  |
Sale of stock pursuant to exercise of underwriters overallotment option |  | 3,600,000 | 3,450,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to purchase shares value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.0
Purchase agreement term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 months |  |  |
Percentage of commitment to purchase shares value as commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |
Commitment fee paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.2 |  |  |  |
Issuance of shares of common stock for commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26.7 | 3.3 |
Underwriting discount and offering expenses |  |  |  |  | 3.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units issued during offering |  |  |  |  | 30,293,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercisable period |  |  |  | 5 years | 5 years | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercise price |  |  |  | $ 1.50 | $ 1.50 | $ 1.94 | $ 7.32 |  |  |  |  |  |  |  |  |  |  |  |
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 to purchase shares of common stock outstanding |  |  |  |  |  |  |  |  |  | 10,913,873 | 6,765,128 |  | 1,800,000 |  |  |  |  |  |
Common stock aggregate offering price |  |  |  |  |  |  |  |  |  |  |  | $ 15 |  |  |  |  |  |  |
Issuance of warrants for common shares to be purchased |  |  |  |  |  |  |  |  |  |  |  |  | 3,550,000 | 3,550,000 |  |  |  |  |
Warrants to purchase common stock |  |  |  |  |  |  |  |  |  | 12,700,000 |  |  |  |  |  |  |  |  |

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