Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Commitments and Contingencies Disclosure [Line Items]
Rent expense	$ 171,034	$ 127,764	$ 352,368	$ 258,985
California State
Commitments and Contingencies Disclosure [Line Items]
Operating leases, space	20,753		20,753
Operating lease expiration date			Jun. 30, 2013
Maryland
Commitments and Contingencies Disclosure [Line Items]
Operating leases, space	1,460		1,460
Operating lease expiration date			Jan. 31, 2013