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Stockholders Equity - Warrants - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 6 Months Ended
Feb. 28, 2015
Oct. 31, 2013
May. 31, 2012
Jun. 30, 2015
Stockholders Equity Note [Line Items]        
Common stock sold through the program (in shares) 2,500,000 1,300,000 1,000,000  
Proceeds from issuance of private placement $ 2.6 $ 7.5 $ 21.5  
Net proceeds from issuance of private placement $ 2.5 $ 6.9 $ 21.1  
2012 Warrants [Member]        
Stockholders Equity Note [Line Items]        
Warrants issued (in shares)     300,000  
Estimated fair value allocated to warrants issued     $ 3.4  
Warrants Exercised (in shares)       200,000
Net proceeds from exercise of warrants       $ 0.1
Term period for warrants       3 years
Warrants expiration date       May 31, 2015
February 2015 Warrants [Member]        
Stockholders Equity Note [Line Items]        
Warrants issued (in shares) 1,100,000      
Estimated fair value allocated to warrants issued $ 0.8      
Term period for warrants       5 years
Warrants exercisable per share price (in dollars per share)       $ 1.38
Number of warrants outstanding (in shares)       1,100,000
2013 Warrants [Member]        
Stockholders Equity Note [Line Items]        
Warrants issued (in shares)   600,000    
Estimated fair value allocated to warrants issued   $ 1.9    
Term period for warrants       5 years
Warrants exercisable per share price (in dollars per share)       $ 7.04
Number of warrants outstanding (in shares)       600,000