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Balance Sheet Accounts (Narrative) (Details)
$ in Thousands

12 Months Ended

Dec. 31, 2018

USD ($)

customer

Dec. 31, 2017

USD ($)

Dec. 31, 2016

USD ($)

^[1]

Concentration Risk [Line Items]

Accounts receivable

$ 349,459

$ 280,892

Depreciation

2,479

2,837

^[1]

$ 3,539

Amortization of acquired intangible assets

$ 2,091

$ 1,040

^[1],[2]

$ 1,040

^[2]

Accounts Receivable | Customer Concentration Risk

Concentration Risk [Line Items]

Number of significant customers | customer

3

Concentration risk, percentage

57.00%

55.00%

Accounts Receivable | Customer Concentration Risk | Customer One

Concentration Risk [Line Items]

Concentration risk, percentage

19.00%

19.00%

Accounts Receivable | Customer Concentration Risk | Customer Two

Concentration Risk [Line Items]

Concentration risk, percentage

19.00%

18.00%

Accounts Receivable | Customer Concentration Risk | Customer Three

Concentration Risk [Line Items]

Concentration risk, percentage

19.00%

18.00%

[1]	As adjusted for the adoption of ASC 606 using the full retrospective method.
[2]	As adjusted for the adoption of ASC 606 using the full retrospective method.

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