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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 790 $ 683
Adjustments to reconcile net income to net cash provided:    
Depreciation, amortization, and impairment of intangible assets 6,020 5,258
Gain on disposal of assets (49)  
Deferred tax benefit (13) (1,134)
Stock-based compensation 1,809 1,076
Changes in assets and liabilities    
Accounts receivable, net 7,181 9,560
Inventories, net (2,414) (255)
Contract assets (4,282)  
Accounts payable (2,195) (748)
Income taxes payable (5,946) (2,740)
Accrued expenses (347) (435)
Deferred compensation (1,069) (906)
Deferred revenue 3,468 1,682
Other assets and liabilities (3,599) (75)
Net cash provided by (used in) operating activities (646) 11,966
Cash flows from investing activities:    
Purchase of short term investments   (99,459)
Maturities of short term investments 80,000 95,000
Purchase of Dealflo, net of cash acquired (53,065)  
Additions to property and equipment (3,016) (716)
Other   (40)
Net cash provided by (used in) investing activities 23,919 (5,215)
Cash flows from financing activities:    
Tax payments for restricted stock issuances (233) (199)
Net cash used in financing activities (233) (199)
Effect of exchange rate changes on cash (269) 505
Net increase in cash 22,771 7,057
Cash and equivalents, beginning of period 78,661 49,345
Cash and equivalents, end of period $ 101,432 $ 56,402