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Condensed Consolidated Financial Statement Detail (Details) | 3 Months Ended | 9 Months Ended |  | 1 Months Ended | 9 Months Ended |  |  |  | 1 Months Ended | 9 Months Ended |  |  | 1 Months Ended |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($) | Dec. 31, 2013 USD ($) | Mar. 31, 2012 Five year warrants issued in March 2012 [Member] USD ($) | Sep. 30, 2014 Five year warrants issued in March 2012 [Member] USD ($) | Sep. 30, 2014 Five year warrants issued in March 2012 [Member] | Dec. 31, 2013 Five year warrants issued in March 2012 [Member] USD ($) | Mar. 31, 2012 Five year warrants issued in March 2012 [Member] | Feb. 28, 2010 Five year warrants issued in February 2010 [Member] USD ($) | Sep. 30, 2014 Five year warrants issued in February 2010 [Member] USD ($) | Dec. 31, 2013 Five year warrants issued in February 2010 [Member] USD ($) | Feb. 28, 2010 Five year warrants issued in February 2010 [Member] | Jun. 30, 2009 Warrants issued to private investors [Member] USD ($) | Sep. 30, 2014 Warrants issued to private investors [Member] USD ($) | Jun. 30, 2009 Warrants issued to private investors [Member] | Sep. 30, 2014 Options Contract [Member] USD ($) Contract | Sep. 30, 2013 Options Contract [Member] USD ($) | Sep. 30, 2014 Options Contract [Member] USD ($) Contract | Sep. 30, 2013 Options Contract [Member] USD ($) | Sep. 30, 2014 Options Contract [Member] EUR (€) | Sep. 30, 2014 Option Contract 1 [Member] EUR (€) | Sep. 30, 2014 Option Contract 2 [Member] EUR (€) | Sep. 30, 2014 Demand Deposits [Member] USD ($) | Dec. 31, 2013 Demand Deposits [Member] USD ($) | Sep. 30, 2014 Money Market Funds [Member] USD ($) | Dec. 31, 2013 Money Market Funds [Member] USD ($) | Sep. 30, 2014 Common stock options and restricted stock units [Member] | Sep. 30, 2013 Common stock options and restricted stock units [Member] | Sep. 30, 2014 Common stock options and restricted stock units [Member] | Sep. 30, 2013 Common stock options and restricted stock units [Member] | Sep. 30, 2014 Warrants for common stock [Member] | Sep. 30, 2013 Warrants for common stock [Member] | Sep. 30, 2014 Warrants for common stock [Member] | Sep. 30, 2013 Warrants for common stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 9,948,000 | 22,795,000 | 8,511,000 | 22,123,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,037,000 | 6,825,000 | 6,601,000 | 6,017,000 | 1,910,000 | 15,970,000 | 1,910,000 | 16,106,000
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss before taxes, Basic | $ (14,399,000) | $ (29,639,000) | $ (30,983,000) | $ (71,774,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment for revaluation of contingent warrant liabilities | 5,360,000 |  | 32,510,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss before taxes, Diluted | (19,759,000) |  | (63,493,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding used for basic net loss per share (in shares) | 107,208,000 | 87,033,000 | 106,768,000 | 84,205,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive warrants (in shares) | 7,115,000 |  | 8,108,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding and dilutive securities used for diluted net income per share (in shares) | 114,323,000 | 87,033,000 | 114,876,000 | 84,205,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,500,000 | 18,900,000 | 34,600,000 | 82,800,000 |  |  |  |  |  |  |  |
Short-term Investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments, U.S. treasury securities | 5,000,000 |  | 5,000,000 |  | 19,990,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivative liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of foreign exchange option contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, amount of hedged item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Derivative, premiums |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  | 300,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued payroll and other benefits | 2,928,000 |  | 2,928,000 |  | 3,009,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued management incentive compensation | 3,187,000 |  | 3,187,000 |  | 4,386,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other | 1,388,000 |  | 1,388,000 |  | 2,539,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | 7,503,000 |  | 7,503,000 |  | 9,934,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant Term |  |  |  |  |  |  | 5 years |  |  |  |  | 5 years |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  |  |  |  |  | 12,109,418 |  | 14,834,577 |  |  |  | 1,260,000 |  |  | 347,826 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  |  | $ 1.76 |  |  |  |  | $ 10.50 |  |  |  | $ 19.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrant liability |  |  |  |  |  |  |  | 33,700,000 |  | 68,700,000 |  |  |  | 1,200,000 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on revaluation of warrant liability |  |  |  |  |  |  |  | 32,500,000 |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of warrant liability to equity |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The condensed consolidated balance sheet as of December 31, 2013 has been derived from the audited consolidated financial statements as of that date included in the Company's Annual Report on Form 10-K for the year ended December 31, 2013.

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