Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Stock Option Activity (Details)

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Stock-Based Compensation - Summary of Stock Option Activity (Details) - Jun. 30, 2015 - $ / shares
Total
Options  
Outstanding at beginning of period 1,383,479
Granted 1,510,759
Exercised 0
Forfeited (962,015)
Expired (359,472)
Outstanding at end of period 1,572,751
Exercisable at end of period 504,121
Vested and expected to vest at end of period 1,523,604
Weighted Average Exercise Price  
Outstanding at beginning of period $ 5.13
Granted 0.95
Exercised 0.00
Forfeited 2.90
Expired 2.86
Outstanding at end of period 3.00
Exercisable at end of period 7.19
Vested and expected to vest at end of period $ 3.06