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Basic and Diluted Net Loss Attributable to Common Stockholders per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator:        
Net loss attributable to common stockholders $ (17,149) $ (14,589) $ (47,706) $ (47,396)
Denominator        
Weighted average common shares outstanding - basic and diluted 78,889,346 49,621,188 70,216,251 49,621,188
Antidilutive securities        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     12,884,000 11,516,000
Options to purchase common stock
       
Antidilutive securities        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     10,329,000 10,112,000
Outstanding warrants, convertible to common stock
       
Antidilutive securities        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     1,600,000 1,404,000
Unvested restricted stock units
       
Antidilutive securities        
Antidilutive securities excluded from computation of diluted earnings per share (in shares)     955,000