Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Class of Stock [Line Items]
Total Stockholders' Equity	$ 52,210,000	$ 68,094,000	$ 36,337,000	$ 15,507,000
Minimum origination fee charged	1.11%	1.11%	1.11%
Maximum origination fee charged	5.00%	5.00%	5.00%
Highly liquid investments classified as cash equivalent, maturity period		3 months
Maximum period for loan classified as non-accrual loan		120 days
Impairment of long-lived assets, held for use	0	0	0
Vesting period		4 years
Total Preferred Stock and Stockholders' Deficit
Class of Stock [Line Items]
Total Stockholders' Equity	$ (50,800,000)
Minimum
Class of Stock [Line Items]
Property and equipment, estimated useful life		2 years
Maximum
Class of Stock [Line Items]
Property and equipment, estimated useful life		5 years
Computer Software, Intangible Asset
Class of Stock [Line Items]
Intangible assets, useful life		3 years