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Subsequent Event - Additional Information (Detail) - Subsequent Event
Apr. 26, 2016
USD ($)
shares
Subsequent Event [Line Items]  
Aggregate commission rate 3.00%
FBR Capital Markets and Company | Maximum  
Subsequent Event [Line Items]  
Customary indemnification rights and expense reimbursements $ 25,000
Sales Agreement | FBR Capital Markets and Company  
Subsequent Event [Line Items]  
Common stock value authorized under sales agreement $ 50,000,000
Number of common stock issued | shares 0