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Supplemental Consolidated Balance Sheet and Statement of Operations Information - Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued Liabilities and Other Liabilities [Abstract]    
Accrued vacation $ 6,087 $ 4,368
Accrued commissions 3,297 2,382
Accrued bonuses 4,419 8,927
Estimated health insurance claims 1,090 1,210
ESPP employee contributions 1,419 0
Accrued other liabilities 3,900 3,808
Accrued expenses and other current liabilities $ 20,212 $ 20,695