Other Equity Transactions - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Jun. 30, 2013	Sep. 30, 2013	Sep. 30, 2012
Other Equity Transactions [Line Items]
Issuance of common stock	8,400,000
Proceeds from issuance of common stock	$ 42,000,000	$ 45,135,280	$ 13,532,285
Performance Shares
Other Equity Transactions [Line Items]
Stock issued during period, shares, new issues	11,905
Stock issued during period, value	67,500
Number of Employees Eligible For Bonuses	2
Bonus
Other Equity Transactions [Line Items]
Stock issued during period, shares, new issues	4,400
Stock issued during period, value	23,848
Number of Employees Eligible For Bonuses	20
Royalty
Other Equity Transactions [Line Items]
Stock issued during period, shares, new issues	4,578
Stock issued during period, value	24,813
Underwriting Agreement
Other Equity Transactions [Line Items]
Proceeds from issuance of common stock	$ 6,300,000
Additional shares issued pursuant to registered offering	1,260,000