Annual report pursuant to Section 13 and 15(d)

Provision for Income Taxes - Schedule of reconciliation of beginning and ending amounts of unrecognized tax benefits (Details)

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Provision for Income Taxes - Schedule of reconciliation of beginning and ending amounts of unrecognized tax benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Unrecognized tax benefits, beginning balance $ 5,793 $ 5,220
Increases related to tax positions taken during a prior year 0 1,161
Decreases related to tax positions taken during a prior year (74) (1,924)
Increases related to tax positions taken during the current year 1,145 1,336
Unrecognized tax benefits, ending balance $ 6,864 $ 5,793