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Component: (Network and Table)
Network
100410 - Disclosure - Share-based Compensation - Summary of RSU Activity (Details)
(http://www.arcabiopharma.com/20161231/taxonomy/role/DisclosureShareBasedCompensationSummaryOfRSUActivityDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000907654 (http://www.sec.gov/CIK)
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
 
 
Restricted Stock Awards, Number of Shares
 
 
Restricted stock units outstanding, beginning of period
62,359  
67,274  
Granted
 
31,309  
Vested and released
(31,149) 
(26,669) 
Forfeited and cancelled
(471) 
(9,555) 
Restricted stock units outstanding, end of period
30,739  
 
62,359  
 
Restricted Stock Awards, Weighted Average Grant Date Fair Value
 
 
Restricted stock units outstanding, beginning of period
8.36  
11.33  
Granted
 
4.77  
Vested and released
8.85  
10.75  
Forfeited and cancelled
4.69  
10.90  
Restricted stock units outstanding, end of period
7.91  
8.36