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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income (loss) $ (118) $ 3,438
Adjustments to reconcile net income (loss) to net cash provided    
Depreciation, amortization, and impairment of intangible assets 9,066 7,893
Loss (gain) on disposal of assets (49) 227
Deferred tax expense (benefit) (3,020) 73
Stock-based compensation 2,916 1,901
Changes in assets and liabilities    
Accounts receivable, net 6,183 3,854
Inventories, net (3,267) (97)
Contract assets (2,892)  
Accounts payable (5,258) (2,808)
Income taxes payable (8,433) (2,089)
Accrued expenses (911) 2,096
Deferred compensation (541) (656)
Deferred revenue (405) 2,093
Other assets and liabilities (2,476) (876)
Net cash provided by (used in) operating activities (9,205) 15,049
Cash flows from investing activities:    
Purchase of short term investments   (168,731)
Maturities of short term investments 80,000 155,000
Purchase of Dealflo, net of cash acquired (53,065)  
Additions to property and equipment (3,410) (1,323)
Other   (462)
Net cash provided by (used in) investing activities 23,525 (15,516)
Cash flows from financing activities:    
Tax payments for restricted stock issuances (399) (257)
Net cash used in financing activities (399) (257)
Effect of exchange rate changes on cash (647) 640
Net increase (decrease) in cash 13,274 (84)
Cash and equivalents, beginning of period 78,661 49,345
Cash and equivalents, end of period $ 91,935 $ 49,261