Stock-based Compensation - Summary of Restricted Stock Unit Awards Activity (Details) - 2012 Long-Term Incentive Plan - RSUs - $ / shares
|
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |
|
|
|
| Outstanding unvested at beginning of period (in shares) |
55,603
|
91,218
|
158,557
|
| Granted (in shares) |
48,323
|
35,752
|
45,914
|
| Vested (in shares) |
(85,036)
|
(50,695)
|
(88,610)
|
| Forfeited (in shares) |
(18,890)
|
(20,672)
|
(24,643)
|
| Outstanding unvested at end of period (in shares) |
0
|
55,603
|
91,218
|
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |
|
|
|
| Outstanding unvested at beginning of period (in dollars per share) |
$ 13.59
|
$ 11.75
|
$ 7.73
|
| Granted (in dollars per share) |
3.44
|
16.68
|
21.43
|
| Vested (in dollars per share) |
7.70
|
12.81
|
10.68
|
| Forfeited (in dollars per share) |
14.15
|
12.74
|
7.75
|
| Outstanding unvested at end of period (in dollars per share) |
$ 0.00
|
$ 13.59
|
$ 11.75
|