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Summary of Significant Accounting Policies - Computation of Basic and Diluted Income (Loss) Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
Net loss used for calculation of basic and diluted EPS $ (34,783) $ (33,846) $ 40,464 $ (30,363) $ (28,451) $ (15,442) $ (21,376) $ 45,129 $ (58,528) $ (20,140) $ (38,313)
Denominator:                      
Weighted average shares outstanding, basic (in shares)                 34,685,274 31,801,645 27,384,990
Effect of dilutive securities:                      
Stock options and restricted stock units (in shares)                 0 0 0
Weighted average shares outstanding, diluted (in shares)                 34,685,274 31,801,645 27,384,990
Net loss per share, basic and diluted (in dollars per share)                 $ (1.69) $ (0.63) $ (1.40)