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100320 - Disclosure - Stock-Based Compensation (Tables)
(http://www.arcadiabio.com/20161231/taxonomy/role/DisclosureStockBasedCompensationTables)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001469443 (http://www.sec.gov/CIK)
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
 
Summary of Activity Under Stock Incentive Plans

The following is a summary of stock option information and weighted average exercise prices under the Company’s stock incentive plans (in thousands, except share data and price per share):

 

 

 

Shares

Subject to

Outstanding

Options

 

 

Weighted-

Average

Exercise

Price Per

Share

 

 

Aggregate

Intrinsic

Value

 

Outstanding — Balance at December 31, 2014

 

 

3,759,839

 

 

$

3.00

 

 

$

12,499

 

Options granted

 

 

352,494

 

 

 

7.30

 

 

 

 

 

Options exercised

 

 

(609,066

)

 

 

0.59

 

 

 

 

 

Options cancelled and forfeited

 

 

(75,758

)

 

 

7.33

 

 

 

 

 

Outstanding — Balance at December 31, 2015

 

 

3,427,509

 

 

$

3.76

 

 

$

3,707

 

Options granted

 

 

1,799,395

 

 

 

5.17

 

 

 

 

 

Options exercised

 

 

(228,141

)

 

 

1.18

 

 

 

 

 

Options cancelled and forfeited

 

 

(419,981

)

 

 

4.49

 

 

 

 

 

Outstanding — Balance at December 31, 2016

 

 

4,578,782

 

 

 

4.38

 

 

$

—

 

Vested and expected to vest — December 31, 2016

 

 

4,561,042

 

 

 

4.37

 

 

$

—

 

Exercisable —December 31, 2016

 

 

2,804,796

 

 

$

3.65

 

 

$

—

 

 

  
Weighted-Average Fair Value Assumption of Stock Option Awards

The fair value of stock option awards to employees was estimated at the date of grant using a Black-Scholes option-pricing model with the following weighted-average assumption:

 

 

 

Year Ended December 31,

 

Assumptions

 

2016

 

 

2015

 

Expected term (years)

 

5.40 - 6.25

 

 

 

5.52

 

Expected volatility

 

87.80% - 91.40%

 

 

 

100%

 

Risk-free interest rate

 

1.17% - 1.54%

 

 

 

1.61%

 

Expected dividend yield

 

 

—

 

 

 

—