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Share-Based Payments - Summary of Expected Restricted Common Stock and RSU Vesting Dates (Detail)
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 323,465
April 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date April 2013
RSU Vesting 3,339
July 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date July 2013
RSU Vesting 4,107
October 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date October 2013
RSU Vesting 1,605
December 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date December 2013
RSU Vesting 66,657
January 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date January 2014
RSU Vesting 94,899
March 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date March 2014
RSU Vesting 6,667
April 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date April 2014
RSU Vesting 1,985
July 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date July 2014
RSU Vesting 2,100
December 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date December 2014
RSU Vesting 66,667
January 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date January 2015
RSU Vesting 796
March 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date March 2015
RSU Vesting 6,667
April 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date April 2015
RSU Vesting 800
July 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date July 2015
RSU Vesting 500
December 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting Date December 2015
RSU Vesting 66,676
Shares Vesting [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 34,295
Shares Vesting [Member] | April 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 2,505
Shares Vesting [Member] | July 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 3,273
Shares Vesting [Member] | October 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 1,189
Shares Vesting [Member] | December 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 6,664
Shares Vesting [Member] | January 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 1,564
Shares Vesting [Member] | April 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 1,568
Shares Vesting [Member] | July 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 2,100
Shares Vesting [Member] | December 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 6,668
Shares Vesting [Member] | January 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 796
Shares Vesting [Member] | April 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 800
Shares Vesting [Member] | July 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 500
Shares Vesting [Member] | December 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 6,668
RSU Vesting [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 289,170
RSU Vesting [Member] | April 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 834
RSU Vesting [Member] | July 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 834
RSU Vesting [Member] | October 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 416
RSU Vesting [Member] | December 2013 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 59,993
RSU Vesting [Member] | January 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 93,335
RSU Vesting [Member] | March 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 6,667
RSU Vesting [Member] | April 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 417
RSU Vesting [Member] | December 2014 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 59,999
RSU Vesting [Member] | March 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 6,667
RSU Vesting [Member] | December 2015 [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU Vesting 60,008