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Capital Stock - Schedule of Vesting Shares Subject to Repurchase (Detail) (Restricted shares subject to repurchase [Member])
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Amortization Expense [Line Items]      
Total 1,092,870 1,456,987 1,156,078
2nd quarter 2014 [Member]
      
Amortization Expense [Line Items]      
Total       
3rd quarter 2014 [Member]
      
Amortization Expense [Line Items]      
Total       
4th quarter 2014 [Member]
      
Amortization Expense [Line Items]      
Total       
1st quarter 2015 [Member]
      
Amortization Expense [Line Items]      
Total 697,451    
2nd quarter 2015 [Member]
      
Amortization Expense [Line Items]      
Total       
3rd quarter 2015 [Member]
      
Amortization Expense [Line Items]      
Total       
4th quarter 2015 [Member]
      
Amortization Expense [Line Items]      
Total       
1st quarter 2016 [Member]
      
Amortization Expense [Line Items]      
Total 312,087    
2nd quarter 2016 [Member]
      
Amortization Expense [Line Items]      
Total       
3rd quarter 2016 [Member]
      
Amortization Expense [Line Items]      
Total       
4th quarter 2016 [Member]
      
Amortization Expense [Line Items]      
Total       
1st quarter 2017 [Member]
      
Amortization Expense [Line Items]      
Total 83,332