Stockholders' Equity - Restricted Stock Units (Details) - 6 months ended Jun. 30, 2015 - $ / shares	Total
Restricted Stock Units
Outstanding at beginning of period (in options)	459,271
Granted (in options)	223,500
Canceled/forfeited (in options)	(78,008)
Outstanding at end of period (in options)	588,470
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 8.95
Granted (in dollars per share)	5.54
Canceled/forfeited (in dollars per share)	6.02
Outstanding at end of period (in dollars per share)	$ 7.26
Weighted Average Remaining Contractual Life (in years)
Outstanding at end of period	8 years 3 months 18 days
Restricted Stock Units (RSUs) [Member]
Restricted Stock Units
Outstanding at beginning of period (in options)	0
Granted (in options)	62,750
Canceled/forfeited (in options)	(5,500)
Outstanding at end of period (in options)	57,250
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 0.00
Granted (in dollars per share)	5.50
Canceled/forfeited (in dollars per share)	5.47
Outstanding at end of period (in dollars per share)	$ 5.51
Weighted Average Remaining Contractual Life (in years)
Outstanding at end of period	1 year 8 months 12 days