Stockholders' Equity - Restricted Stock Units (Details)	9 Months Ended
	Sep. 30, 2016 $ / shares shares
Restricted Stock Units
Outstanding at beginning of period (in shares) | shares	602,207
Granted (in shares) | shares	159,568
Canceled/forfeited (in shares) | shares	(103,289)
Outstanding at end of period (in shares) | shares	590,179
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	15.80
Outstanding at end of period (in dollars per share) | $ / shares	$ 7.47
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	279,754
Released (in shares) | shares	(10,000)
Canceled/forfeited (in shares) | shares	(60,580)
Outstanding at end of period (in shares) | shares	266,674
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 7.31
Granted (in dollars per share) | $ / shares	6.62
Released (in dollars per share) | $ / shares	15.08
Canceled/forfeited (in dollars per share) | $ / shares	6.96
Outstanding at end of period (in dollars per share) | $ / shares	$ 6.37
Weighted Average Remaining Contractual Life (in years)
Outstanding at end of period	3 years 3 months 18 days