Income Tax Provision - Reconciliation of Gross Unrecognized Tax Benefits (Details) - USD ($) |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | |||
Beginning balance, January 1 | $ 0 | $ 0 | $ 700,000 |
Tax positions related to prior years: | |||
Reductions | 0 | 0 | (700,000) |
Ending balance, December 31 | $ 0 | $ 0 | $ 0 |