Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended |
Sep. 30, 2016 | Sep. 30, 2015 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | |
Stock-based compensation | $ 2,373 | $ 5,130 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] | | |
Options outstanding, beginning of period (in shares) | 4,602,746 | |
Granted (in shares) | 150,371 | |
Exercised (in shares) | 0 | |
Forfeited (in shares) | (342,533) | |
Vested options expired (in shares) | (366,947) | |
Options outstanding, end of period (in shares) | 4,043,637 | |
Excisable (in shares) | 2,784,573 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] | | |
Options outstanding, end of period (in dollars per share) | $ 8.74 | |
Granted (in dollars per share) | 2.61 | |
Exercised (in dollars per share) | 0 | |
Forfeited (in dollars per share) | 7.49 | |
Vested options expired (in dollars per share) | 17.73 | |
Options outstanding, beginning of period (in dollars per share) | 7.80 | |
Exercisable (in dollars per share) | $ 9.45 | |
Options outstanding, weighted-average remaining contractual term | 5 years 8 months 1 day | |
Exercisable, weighted-average remaining contractual term | 3 years 8 months 23 days | |
Unrecognized compensation costs, unvested stock options | $ 1,800 | |
Stock Options | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | |
Expiration period | 10 years | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] | | |
Unrecognized compensation costs, unvested stock option recognition period | 2 years 5 months 12 days | |
Stock Compensation Plan | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] | | |
Unrecognized compensation costs, unvested stock option recognition period | 1 year 11 months 1 day | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] | | |
Shares outstanding, beginning of period (in shares) | 962,446 | |
Granted (in shares) | 741,954 | |
Vested (in shares) | (355,061) | |
Forfeited (in shares) | (138,360) | |
Shares outstanding, end of period (in shares) | 1,210,979 | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] | | |
Shares outstanding, beginning of period (in dollars per shares) | $ 6.57 | |
Granted (in dollars per shares) | 2.63 | |
Vested (in dollars per shares) | 6.76 | |
Forfeited (in dollars per shares) | 7.67 | |
Shares outstanding, end of period (in dollars per shares) | $ 3.97 | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Unrecognized compensation costs | $ 4,100 | |
Performance Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] | | |
Unrecognized compensation costs, unvested stock option recognition period | 2 years 4 months 28 days | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] | | |
Shares outstanding, beginning of period (in shares) | 701,384 | |
Granted (in shares) | 473,000 | |
Vested (in shares) | 0 | |
Forfeited (in shares) | (197,647) | |
Shares outstanding, beginning of period (in shares) | 976,737 | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Shares outstanding, beginning of period (in dollars per share) | $ 2.76 | |
Granted (in dollars per share) | 1.90 | |
Vested (in dollars per share) | 0 | |
Forfeited (in dollars per share) | 6.88 | |
Shares outstanding, beginning of period (in dollars per share) | $ 4.51 | |
Unrecognized compensation costs | $ 1,500 | |
Phantom Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] | | |
Unrecognized compensation costs, unvested stock option recognition period | 3 years 6 months 15 days | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] | | |
Shares outstanding, beginning of period (in shares) | 0 | |
Granted (in shares) | 781,645 | |
Vested (in shares) | 0 | |
Forfeited (in shares) | (57,617) | |
Shares outstanding, beginning of period (in shares) | 724,028 | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Shares outstanding, beginning of period (in dollars per share) | $ 2.69 | |
Granted (in dollars per share) | 2.69 | |
Vested (in dollars per share) | 0 | |
Forfeited (in dollars per share) | 2.69 | |
Shares outstanding, beginning of period (in dollars per share) | $ 0 | |
Unrecognized compensation costs | $ 1,100 | |
Cash Performance Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] | | |
Unrecognized compensation costs, unvested stock option recognition period | 2 years 4 months 17 days | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] | | |
Shares outstanding, beginning of period (in shares) | 0 | |
Granted (in shares) | 512,127 | |
Vested (in shares) | 0 | |
Forfeited (in shares) | 0 | |
Shares outstanding, beginning of period (in shares) | 512,127 | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Shares outstanding, beginning of period (in dollars per share) | $ 2.69 | |
Granted (in dollars per share) | 2.69 | |
Vested (in dollars per share) | 0 | |
Forfeited (in dollars per share) | 0 | |
Shares outstanding, beginning of period (in dollars per share) | $ 0 | |
Unrecognized compensation costs | $ 800 | |
Minimum | Performance Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 0.00% | |
Minimum | Cash Performance Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 0.00% | |
Maximum | Performance Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 100.00% | |
Maximum | Cash Performance Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 100.00% | |
First anniversary, vesting percentage | Stock Options | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 25.00% | |
First anniversary, vesting percentage | Stock Compensation Plan | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 33.33% | |
First anniversary, vesting percentage | Performance Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 33.33% | |
First anniversary, vesting percentage | Phantom Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 25.00% | |
Second anniversary, vesting percentage | Stock Options | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 25.00% | |
Second anniversary, vesting percentage | Stock Compensation Plan | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 33.33% | |
Second anniversary, vesting percentage | Performance Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 33.33% | |
Second anniversary, vesting percentage | Phantom Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 25.00% | |
Third anniversary, vesting percentage | Stock Options | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 25.00% | |
Third anniversary, vesting percentage | Stock Compensation Plan | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 33.33% | |
Third anniversary, vesting percentage | Performance Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 33.33% | |
Third anniversary, vesting percentage | Phantom Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 25.00% | |
Fourth anniversary, vesting percentage | Stock Options | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 25.00% | |
Fourth anniversary, vesting percentage | Phantom Stock Units | | |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract] | | |
Vesting percentage | 25.00% | |