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Share-Based Compensation - Summary of Company's Restricted Stock Activity (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Shares    
Unvested at beginning of period (in shares) 790,688 338,702
Granted (in shares) 301,040 1,539,114
Vested (in shares) (959,196) (1,087,128)
Forfeitures (in shares) (16,611) 0
Unvested at end of period (in shares) 115,921 790,688
Weighted Average Grant Date Fair Value    
Unvested at beginning of period (in usd per share) $ 8.14 $ 4.26
Granted (in usd per share) 3.89 9.14
Vested (in usd per share) 7.17 8.35
Forfeitures (in usd per share) 5.03 0.00
Unvested at end of period (in usd per share) $ 5.59 $ 8.14