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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income (loss) $ (734) $ (1,848)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Provision for doubtful accounts 379 742
Depreciation and amortization 9,090 9,427
Deferred income taxes (888) (45)
Gain (Loss) on Disposition of Property Plant Equipment 799 38
Compensation expense related to stock-based awards and employee stock purchase plan 2,792 2,832
Foreign Currency Transaction Gain (Loss), Unrealized 894 191
Changes in operating assets and liabilities:    
Accounts receivable 10,819 644
Inventories 421 (3,807)
Prepaid expenses and other assets (2,932) (2,282)
Other non-current assets (2,190) 1,043
Accounts payable (1,168) (2,145)
Deferred revenue 3,829 355
Accrued expenses (2,029) 5,602
Other long-term liabilities (113) (96)
Net cash provided by operating activities 18,969 10,651
Cash flows from investing activities:    
Capital expenditures (4,791) (4,881)
Purchases of marketable securities (10,629) (13,807)
Maturities and sales of marketable securities 4,563 11,719
Net cash used in investing activities (10,857) (6,969)
Cash flows from financing activities:    
Repayments of Long-term loan 3,656 3,656
Repayments of Other Long-term Debt (1,014) (980)
Payments of employee restricted stock withholdings 313 345
Proceeds From Stock Options Exercised and Employee Stock Purchase Plan 390 260
Net cash used in financing activities (4,593) (4,721)
Effect of exchange rate changes on cash and cash equivalents (1,139) (627)
Net increase (decrease) in cash and cash equivalents 2,380 (1,666)
Cash and cash equivalents at beginning of period 22,719 25,289
Cash and cash equivalents at end of period $ 25,099 $ 23,623