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Subsequent Event - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 11, 2017
Mar. 31, 2017
Mar. 31, 2016
Subsequent Event [Line Items]      
Net proceeds from offering   $ 3,099 $ 1,213
Subsequent Event [Member] | Follow-on Offering [Member]      
Subsequent Event [Line Items]      
Common stock shares sold 5,228,750    
Public offering price $ 22.95    
Net proceeds from offering $ 115,100    
Underwriting discounts and commissions 4,900    
Offering expenses $ 400