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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator:                      
Net loss used for calculation of basic and diluted EPS $ (28,451) $ (15,442) $ (21,376) $ 45,129 $ (19,018) $ (3,928) $ (12,259) $ (3,108) $ (20,140) $ (38,313) $ (261)
Denominator:                      
Weighted average shares outstanding, basic (in shares)                 31,801,645 27,384,990 6,847,697
Effect of dilutive securities:                      
Stock options and restricted stock units                 0 0 0
Weighted average shares outstanding, diluted (in shares)                 31,801,645 27,384,990 6,847,697
Net loss per share, basic and diluted (in dollars per share)                 $ (0.63) $ (1.40) $ (0.04)