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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:    
Net Income $ 1,792 $ 573
Adjustments to reconcile net income (loss) from operations to net cash provided by operations:    
Depreciation and amortization 2,747 2,633
Deferred tax benefit (9) (395)
Stock-based compensation 800 544
Changes in assets and liabilities, net of effect of acquisitions:    
Accounts receivable, net 14,185 1,715
Inventories, net 535 (1,403)
Contract assets (4,195)  
Accounts payable (3,360) (1,507)
Income taxes payable (3,012) (2,914)
Accrued expenses (821) 1,265
Deferred compensation (1,258) 243
Deferred revenue 3,424 1,691
Other (1,102) (738)
Net cash provided by operating activities 9,726 1,707
Cash flows from investing activities    
Purchase of short term investments   (69,626)
Maturities of short term investments 40,000 75,000
Additions to property and equipment (2,296) (247)
Net cash provided by investing activities 37,704 5,127
Cash flows from financing activities of continuing operations:    
Tax payments for restricted stock issuances (179) (154)
Net cash used in financing activities (179) (154)
Effect of exchange rate changes on cash 572 253
Net increase in cash 47,823 6,933
Cash and equivalents, beginning of period 78,661 49,345
Cash and equivalents, end of period $ 126,484 $ 78,661