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Condensed Consolidated Financial Statement Detail (Details)
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3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||||||||||||||||||
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Jun. 30, 2014
USD ($)
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Jun. 30, 2013
USD ($)
|
Jun. 30, 2014
USD ($)
|
Jun. 30, 2013
USD ($)
|
Dec. 31, 2013
USD ($)
|
Feb. 28, 2010
Five year warrants issued in February 2010 [Member]
USD ($)
|
Jun. 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]
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Mar. 31, 2012
Five year warrants issued in March 2012 [Member]
USD ($)
|
Jun. 30, 2014
Five year warrants issued in March 2012 [Member]
USD ($)
|
Jun. 30, 2014
Five year warrants issued in March 2012 [Member]
|
Dec. 31, 2013
Five year warrants issued in March 2012 [Member]
USD ($)
|
Mar. 31, 2012
Five year warrants issued in March 2012 [Member]
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Jun. 30, 2009
Warrants issued to private investors [Member]
USD ($)
|
Jun. 30, 2014
Warrants issued to private investors [Member]
USD ($)
|
Jun. 30, 2009
Warrants issued to private investors [Member]
|
Jun. 30, 2014
Options Contract [Member]
USD ($)
Contract
|
Jun. 30, 2013
Options Contract [Member]
USD ($)
|
Jun. 30, 2014
Options Contract [Member]
USD ($)
Contract
|
Jun. 30, 2013
Options Contract [Member]
USD ($)
|
Jun. 30, 2014
Options Contract [Member]
EUR (€)
|
Jun. 30, 2014
Option Contract 1 [Member]
EUR (€)
|
Jun. 30, 2014
Option Contract 2 [Member]
EUR (€)
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Jun. 30, 2014
Demand Deposits [Member]
USD ($)
|
Dec. 31, 2013
Demand Deposits [Member]
USD ($)
|
Jun. 30, 2014
Money Market Funds [Member]
USD ($)
|
Dec. 31, 2013
Money Market Funds [Member]
USD ($)
|
Jun. 30, 2014
Common stock options and restricted stock units [Member]
|
Jun. 30, 2013
Common stock options and restricted stock units [Member]
|
Jun. 30, 2014
Common stock options and restricted stock units [Member]
|
Jun. 30, 2013
Common stock options and restricted stock units [Member]
|
Jun. 30, 2014
Warrants for common stock [Member]
|
Jun. 30, 2013
Warrants for common stock [Member]
|
Jun. 30, 2014
Warrants for common stock [Member]
|
Jun. 30, 2013
Warrants for common stock [Member]
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||||||||||||||||||||||||||||||||||||||
| Antidilutive securities excluded from computation of earnings per share (in shares) | 9,849,000 | 23,522,000 | 8,486,000 | 23,260,000 | 7,939,000 | 7,346,000 | 6,576,000 | 7,084,000 | 1,910,000 | 16,176,000 | 1,910,000 | 16,176,000 | |||||||||||||||||||||||||||
| Numerator [Abstract] | |||||||||||||||||||||||||||||||||||||||
| Net loss, Basic | $ (11,897,000) | $ (17,248,000) | $ (16,584,000) | $ (42,135,000) | |||||||||||||||||||||||||||||||||||
| Adjustment for revaluation of contingent warrant liabilities | (7,616,000) | (27,150,000) | |||||||||||||||||||||||||||||||||||||
| Net loss, Diluted | (19,513,000) | (43,734,000) | |||||||||||||||||||||||||||||||||||||
| Denominator Abstract] | |||||||||||||||||||||||||||||||||||||||
| Weighted average shares outstanding used for basic net loss per share (in shares) | 106,927,000 | 82,939,000 | 106,545,000 | 82,768,000 | |||||||||||||||||||||||||||||||||||
| Effect of dilutive warrants (in shares) | 7,199,000 | 8,503,000 | |||||||||||||||||||||||||||||||||||||
| Weighted average shares outstanding and dilutive securities used for diluted net income per share (in shares) | 114,126,000 | 82,939,000 | 115,048,000 | 82,768,000 | |||||||||||||||||||||||||||||||||||
| Cash and Cash Equivalents [Line Items] | |||||||||||||||||||||||||||||||||||||||
| Cash equivalents | 16,300,000 | 18,900,000 | 49,600,000 | 82,800,000 | |||||||||||||||||||||||||||||||||||
| Short-term Investments [Abstract] | |||||||||||||||||||||||||||||||||||||||
| Short-term investments, U.S. treasury securities | 9,998,000 | 9,998,000 | 19,990,000 | [1] | |||||||||||||||||||||||||||||||||||
| 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 | 2,000 | 200,000 | 200,000 | |||||||||||||||||||||||||||||||||||
| Accrued liabilities [Abstract] | |||||||||||||||||||||||||||||||||||||||
| Accrued payroll and other benefits | 2,698,000 | 2,698,000 | 3,009,000 | ||||||||||||||||||||||||||||||||||||
| Accrued management incentive compensation | 2,123,000 | 2,123,000 | 4,386,000 | ||||||||||||||||||||||||||||||||||||
| Other | 1,568,000 | 1,568,000 | 2,539,000 | ||||||||||||||||||||||||||||||||||||
| Total | 6,389,000 | 6,389,000 | 9,934,000 | [1] | |||||||||||||||||||||||||||||||||||
| Class of Warrant or Right [Line Items] | |||||||||||||||||||||||||||||||||||||||
| Warrants outstanding (in shares) | 1,260,000 | 12,109,418 | 14,834,577 | 347,826 | |||||||||||||||||||||||||||||||||||
| Exercise price (in dollars per share) | $ 10.50 | $ 1.76 | $ 19.50 | ||||||||||||||||||||||||||||||||||||
| Fair value of warrant liability | 1,200,000 | 39,000,000 | 68,700,000 | 400,000 | |||||||||||||||||||||||||||||||||||
| Gain (loss) on revaluation of warrant liability | 800,000 | 27,200,000 | |||||||||||||||||||||||||||||||||||||
| Warrant Term | 5 years | 5 years | 5 years | ||||||||||||||||||||||||||||||||||||
| Reclassification of warrant liability to equity | $ 2,500,000 | ||||||||||||||||||||||||||||||||||||||
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