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Condensed Consolidated Financial Statement Detail (Details)
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3 Months Ended | 6 Months Ended | 1 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, 2013
USD ($)
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Jun. 30, 2012
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Jun. 30, 2013
USD ($)
|
Jun. 30, 2012
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Dec. 31, 2012
USD ($)
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Feb. 28, 2010
Five year warrants issued in February 2010 [Member]
USD ($)
|
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]
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Jun. 30, 2013
Five year warrants issued in March 2012 [Member]
USD ($)
|
Jun. 30, 2013
Five year warrants issued in March 2012 [Member]
|
Mar. 31, 2013
Five year warrants issued in March 2012 [Member]
USD ($)
|
Dec. 31, 2012
Five year warrants issued in March 2012 [Member]
USD ($)
|
Jun. 30, 2009
Warrants issued to private investors [Member]
USD ($)
|
Jun. 30, 2009
Warrants issued to private investors [Member]
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Jun. 30, 2013
Options Contract [Member]
USD ($)
Contract
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Jun. 30, 2012
Options Contract [Member]
USD ($)
|
Jun. 30, 2013
Options Contract [Member]
USD ($)
Contract
|
Jun. 30, 2012
Options Contract [Member]
USD ($)
|
Jun. 30, 2013
Options Contract [Member]
EUR (€)
|
Jun. 30, 2013
Option Contract 1 [Member]
EUR (€)
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Jun. 30, 2013
Option Contract 2 [Member]
EUR (€)
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Jun. 30, 2013
Demand Deposits [Member]
USD ($)
|
Dec. 31, 2012
Demand Deposits [Member]
USD ($)
|
Jun. 30, 2013
Money Market Funds [Member]
USD ($)
|
Dec. 31, 2012
Money Market Funds [Member]
USD ($)
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Jun. 30, 2013
Common stock options and restricted stock units [Member]
|
Jun. 30, 2012
Common stock options and restricted stock units [Member]
|
Jun. 30, 2013
Common stock options and restricted stock units [Member]
|
Jun. 30, 2012
Common stock options and restricted stock units [Member]
|
Jun. 30, 2013
Warrants for common stock [Member]
|
Jun. 30, 2012
Warrants for common stock [Member]
|
Jun. 30, 2013
Warrants for common stock [Member]
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Jun. 30, 2012
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) | 23,522,000 | 21,823,000 | 23,260,000 | 16,645,000 | 7,346,000 | 5,121,000 | 7,084,000 | 5,566,000 | 16,176,000 | 16,702,000 | 16,176,000 | 11,079,000 | ||||||||||||||||||||||||
| Cash and Cash Equivalents [Line Items] | ||||||||||||||||||||||||||||||||||||
| Cash equivalents | $ 10,100,000 | $ 7,800,000 | $ 47,800,000 | $ 37,500,000 | ||||||||||||||||||||||||||||||||
| Short-term Investments [Abstract] | ||||||||||||||||||||||||||||||||||||
| Short-term investments, U.S. treasury securities | 0 | 0 | 39,987,000 | [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 | 300,000 | 300,000 | ||||||||||||||||||||||||||||||||||
| Derivative, loss | 2,000 | 300,000 | 200,000 | 600,000 | ||||||||||||||||||||||||||||||||
| Accrued liabilities [Abstract] | ||||||||||||||||||||||||||||||||||||
| Accrued payroll and other benefits | 2,604,000 | 2,604,000 | 2,461,000 | |||||||||||||||||||||||||||||||||
| Accrued management incentive compensation | 2,177,000 | 2,177,000 | 3,978,000 | |||||||||||||||||||||||||||||||||
| Accrued clinical trial costs | 659,000 | 659,000 | 4,702,000 | |||||||||||||||||||||||||||||||||
| Other | 1,189,000 | 1,189,000 | 1,904,000 | |||||||||||||||||||||||||||||||||
| Total | 6,629,000 | 6,629,000 | 13,045,000 | [1] | ||||||||||||||||||||||||||||||||
| Class of Warrant or Right [Line Items] | ||||||||||||||||||||||||||||||||||||
| Warrants outstanding (in shares) | 1,260,000 | 14,264,470 | 14,834,577 | 347,826 | ||||||||||||||||||||||||||||||||
| Exercise price (in dollars per share) | $ 10.50 | $ 1.76 | $ 19.50 | |||||||||||||||||||||||||||||||||
| Fair value of warrant liability | 26,000 | 26,000 | 29,600,000 | 15,000,000 | ||||||||||||||||||||||||||||||||
| Gain (loss) on revaluation of warrant liability | $ 14,600,000 | |||||||||||||||||||||||||||||||||||
| Warrant Term | 5 years | 5 years | 5 years | |||||||||||||||||||||||||||||||||
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