Stockholders' Equity (Deficit) - Assumptions Related to Share-based Compensation (Details) - $ / shares
|
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Grants in period, weighted average grant date fair value |
$ 8.95
|
$ 14.74
|
$ 3.02
|
| Stock Option [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Volatility |
53.00%
|
60.00%
|
|
| Expected life (in years) |
6 years 2 months 1 day
|
|
|
| Risk-free interest rate, minimum |
1.38%
|
1.53%
|
0.70%
|
| Risk-free interest rate, maximum |
1.91%
|
2.05%
|
1.80%
|
| Dividend yield |
0.00%
|
0.00%
|
0.00%
|
| Minimum [Member] | Stock Option [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Volatility |
|
|
58.00%
|
| Expected life (in years) |
|
5 years
|
5 years
|
| Maximum [Member] | Stock Option [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Volatility |
|
|
60.00%
|
| Expected life (in years) |
|
6 years 3 months 18 days
|
7 years 2 months 12 days
|