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