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Springstone Acquisition - Summary of Pro Forma Financial Information (Detail) (Springstone Financial, Llc, USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Springstone Financial, Llc
 
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]  
Total net revenue $ 43,514us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= ck0001409970_SpringstoneFinancialLlcMember
Net loss $ (7,708)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= ck0001409970_SpringstoneFinancialLlcMember
Basic net loss per share attributable to common stockholders ($ per share) $ (0.14)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= ck0001409970_SpringstoneFinancialLlcMember
Diluted net loss per share attributable to common stockholders ($ per share) $ (0.14)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= ck0001409970_SpringstoneFinancialLlcMember