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Summary of Significant Accounting Policies - Allowance For Doubtful Accounts Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for doubtful accounts receivable [Roll Forward]      
Beginning balance $ 2,723 $ 1,705 $ 929
Additions to sales allowance and bad debt expense 1,337 1,610 1,305
Deductions (write-offs/recoveries) from reserve (531) (592) (529)
Ending balance 3,534 2,723 1,705
Allowance, net of FX [Member]      
Allowance for doubtful accounts receivable [Roll Forward]      
Additions to sales allowance and bad debt expense $ 1,342 $ 1,610 $ 1,305