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Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2016
Jan. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]          
Common stock issued (in shares) 8,222,500 2,645,000      
Common stock issue price (in dollars per share) $ 7.00 $ 50.00      
Number of shares issued upon full exercise of options granted to underwriters (in shares) 1,072,500 345,000      
Net proceeds from private placement $ 53,900 $ 124,100 $ 0 $ 53,925 $ 124,063
Outstanding stock options (in shares)     5,746 4,611  
Outstanding restricted stock units (in shares)     0 50