Options

Weighted-Average Exercise Price

Weighted-Average Remaining Contractual Term (years)

Aggregate Intrinsic Value

Outstanding at December 31, 2014

1,235,526

$

4.19

7.1

$

7,709

Granted

399,929

$

10.61

Exercised

(236

)

$

1.27

Outstanding at March 31, 2015

1,635,219

$

5.76

7.6

$

9,632

Exercisable at March 31, 2015

593,324

$

2.38

4.4

$

5,505

Vested or expected to vest at March 31, 2015 (1)

1,526,587

$

5.65

7.4

$

9,153