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Share-Based Payments - Summary of Expected Restricted Common Stock and RSU Vesting Dates (Details)
 6 Months Ended
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 341,430
July 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date July 2013
Awards Vesting 4,251
October 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date October 2013
Awards Vesting 3,341
December 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date December 2013
Awards Vesting 69,991
January 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date January 2014
Awards Vesting 95,839
March 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date March 2014
Awards Vesting 6,667
April 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date April 2014
Awards Vesting 2,925
July 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date July 2014
Awards Vesting 2,240
October 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date October 2014
Awards Vesting 1,736
December 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date December 2014
Awards Vesting 70,000
January 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date January 2015
Awards Vesting 1,744
March 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date March 2015
Awards Vesting 6,667
April 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date April 2015
Awards Vesting 1,744
July 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date July 2015
Awards Vesting 1,444
October 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date October 2015
Awards Vesting 944
December 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date December 2015
Awards Vesting 70,009
January 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date January 2016
Awards Vesting 944
April 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date April 2016
Awards Vesting 944
Shares Vesting [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 43,094
Shares Vesting [Member] | July 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 3,417
Shares Vesting [Member] | October 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 2,925
Shares Vesting [Member] | December 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 6,664
Shares Vesting [Member] | January 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 2,504
Shares Vesting [Member] | March 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting   
Shares Vesting [Member] | April 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 2,508
Shares Vesting [Member] | July 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 2,240
Shares Vesting [Member] | October 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 1,736
Shares Vesting [Member] | December 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 6,668
Shares Vesting [Member] | January 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 1,744
Shares Vesting [Member] | March 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting   
Shares Vesting [Member] | April 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 1,744
Shares Vesting [Member] | July 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 1,444
Shares Vesting [Member] | October 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 944
Shares Vesting [Member] | December 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 6,668
Shares Vesting [Member] | January 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 944
Shares Vesting [Member] | April 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 944
RSU Vesting [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 298,336
RSU Vesting [Member] | July 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 834
RSU Vesting [Member] | October 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 416
RSU Vesting [Member] | December 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 63,327
RSU Vesting [Member] | January 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 93,335
RSU Vesting [Member] | March 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 6,667
RSU Vesting [Member] | April 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 417
RSU Vesting [Member] | July 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting   
RSU Vesting [Member] | October 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 0
RSU Vesting [Member] | December 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 63,332
RSU Vesting [Member] | January 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting   
RSU Vesting [Member] | March 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 6,667
RSU Vesting [Member] | April 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting   
RSU Vesting [Member] | July 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting   
RSU Vesting [Member] | October 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting   
RSU Vesting [Member] | December 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting 63,341
RSU Vesting [Member] | January 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting   
RSU Vesting [Member] | April 2016 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Vesting