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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                      
Net loss used for calculation of basic and diluted EPS $ 105,727 $ (47,043) $ (40,654) $ (37,655) $ (34,783) $ (33,846) $ 40,464 $ (30,363) $ (19,626) $ (58,528) $ (20,140)
Denominator:                      
Weighted average shares outstanding, basic                 36,095,080 34,685,274 31,801,645
Effect of dilutive securities:                      
Stock options and restricted stock units                 0 0 0
Weighted average shares outstanding, diluted                 36,095,080 34,685,274 31,801,645
Net loss per share, basic and diluted                 $ (0.54) $ (1.69) $ (0.63)