Stockholders' Equity - Restricted Stock Units (Details)	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Restricted Stock Units
Outstanding at beginning of period (in shares) | shares	602,207
Granted (in shares) | shares	123,790
Canceled/forfeited (in shares) | shares	(43,725)
Outstanding at end of period (in shares) | shares	613,965
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 8.58
Granted (in dollars per share) | $ / shares	7.42
Canceled/forfeited (in dollars per share) | $ / shares	7.97
Outstanding at end of period (in dollars per share) | $ / shares	$ 8.84
Weighted Average Remaining Contractual Life (in years)
Outstanding at end of period	7 years 10 months 24 days
Restricted Stock Units
Restricted Stock Units
Outstanding at beginning of period (in shares) | shares	57,500
Granted (in shares) | shares	270,895
Released (in shares) | shares	(10,000)
Canceled/forfeited (in shares) | shares	(45,770)
Outstanding at end of period (in shares) | shares	272,625
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 7.31
Granted (in dollars per share) | $ / shares	6.67
Released (in dollars per share) | $ / shares	15.08
Canceled/forfeited (in dollars per share) | $ / shares	6.84
Outstanding at end of period (in dollars per share) | $ / shares	$ 6.47
Weighted Average Remaining Contractual Life (in years)
Outstanding at end of period	2 years