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Rights Offering (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended
May 19, 2014
Dec. 31, 2016
Dec. 09, 2015
May 01, 2014
Apr. 28, 2014
Apr. 07, 2014
Mar. 14, 2014
Apr. 30, 2012
Class of Warrant or Right [Line Items]                
Warrants and rights outstanding           $ 45,000    
Non-transferable subscription rights for each share of common stock owned on the record date (shares)             0.063921  
Subscription right to purchase common stock (dollars per share)             $ 16.80 $ 1.03
Share price (dollars per share)   $ 20.75 $ 17   $ 17.54 $ 17.64    
Standby purchase agreement issuance of unsubscribed shares to related party (shares) 2,700,000         2,700,000    
Gross proceeds from issuance of warrants $ 45,000              
Costs associated with rights offering $ 125              
Standby Purchasers                
Class of Warrant or Right [Line Items]                
Standby purchase agreement issuance of unsubscribed shares to related party (shares)       297,619        
Oracle Institutional Partners, L.P.                
Class of Warrant or Right [Line Items]                
Standby purchase agreement issuance of unsubscribed shares to related party (shares)       119,047        
Oracle Partners, L.P.                
Class of Warrant or Right [Line Items]                
Standby purchase agreement issuance of unsubscribed shares to related party (shares)       178,572