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Supplemental Consolidated Balance Sheet and Statement of Operations Information (Tables)
 9 Months Ended
Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Accrued Expenses and Other Current Liabilities
Accrued expenses and other current liabilities consisted of (in thousands):

 September 30, 2017 December 31, 2016
Accrued vacation $5,826  $4,368 
Accrued commissions 2,429  2,382 
Accrued bonuses 7,642  8,927 
Estimated health insurance claims 1,100  1,210 
Accrued other liabilities 3,774  3,808 
 $20,771  $20,695 
Schedule of Other Income and (Expense), net
Other income, net for the three and nine months ended September 30, 2017 and 2016 consisted of (in thousands):

 Three months ended September 30,  Nine months ended September 30, 
 2017  2016  2017  2016 
Interest income $168 $64 $388 $209 
Income from training reimbursement program 207 247 943 910 
Other (177)(13)(345)33 
$198 $298 $986 $1,152