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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
May 03, 2017
Apr. 26, 2017
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Subsidiary, Sale of Stock [Line Items]          
Proceeds from issuance of common stock, net of offering costs       $ 34,294 $ 0
Registered Direct Offering          
Subsidiary, Sale of Stock [Line Items]          
Shares of common stock purchased (in shares)   1,100,000      
Common stock purchase price (in dollars per share)   $ 21.50      
Proceeds from issuance of common stock, net of offering costs   $ 23,700      
At the Market Offering          
Subsidiary, Sale of Stock [Line Items]          
Shares of common stock purchased (in shares)     62,342 599,284  
Common stock maximum amount available for issuance $ 75,000        
Proceeds of stock sale     $ 1,100 $ 10,800