Summary of Significant Accounting Policies - Long-Lived Assets, Goodwill, Revenue Recognition (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Accounting Policies [Abstract] | |||
| Deferred revenue | $ 500,000 | $ 500,000 | |
| Impairment charges recorded on goodwill | 0 | 0 | $ 0 |
| Impairment charges recorded on long lived assets | $ 0 | $ 0 | $ 0 |