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Net Loss per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Calculation of net loss and the number of shares used to compute basic and diluted earnings per share [Abstract]        
Net loss - basic $ (4,600) $ (5,482) $ (9,878) $ (18,328)
Adjustment for gain on warrant derivative liability (356) 0 (363) 0
Net loss - diluted $ (4,956) $ (5,482) $ (10,241) $ (18,328)
Weighted average shares outstanding - basic (in shares) 9,426,169 [1] 6,023,785 [1] 9,363,123 [1] 5,683,380 [1]
Adjustment for warrant exercises (in shares) 54,764 0 99,594 0
Weighted average shares outstanding - diluted (in shares) 9,480,933 [1] 6,023,785 [1] 9,462,717 [1] 5,683,380 [1]
Net loss per share - basic (in dollars per share) $ (0.49) [1] $ (0.91) [1] $ (1.06) [1] $ (3.22) [1]
Net loss per share - diluted (in dollars per share) $ (0.52) [1] $ (0.91) [1] $ (1.08) [1] $ (3.22) [1]
Antidilutive securities excluded from computation of earnings per share (in shares)     791,451 688,208
Stock Options [Member]
        
Calculation of net loss and the number of shares used to compute basic and diluted earnings per share [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares)     199,230 323,417
Unvested Restricted Stock [Member]
        
Calculation of net loss and the number of shares used to compute basic and diluted earnings per share [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares)     2,721 24,797
Warrants [Member]
        
Calculation of net loss and the number of shares used to compute basic and diluted earnings per share [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares)     589,500 339,994
[1] Reflects a one-for- sixteen (1:16) reverse stock split effected on April 8, 2014.