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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income (loss) $ (2,791) $ (1,422)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Provision for doubtful accounts 403 502
Depreciation and amortization 3,189 3,129
Deferred income taxes 13 (426)
Gain (Loss) on Disposition of Property Plant Equipment 256 39
(Gain) loss on derivative instruments (19) 13
Compensation expense related to stock-based awards and employee stock purchase plan 1,052 958
Foreign Currency Transaction Gain (Loss), Unrealized 536 0
Changes in operating assets and liabilities:    
Accounts receivable 11,516 734
Inventories (1,572) (1,214)
Prepaid expenses and other assets (1,167) (565)
Other non-current assets (525) (428)
Accounts payable (1,123) (813)
Deferred revenue 894 5,418
Accrued expenses (1,986) (2,710)
Other long-term liabilities (38) (11)
Net cash provided by operating activities 8,638 3,204
Cash flows from investing activities:    
Capital expenditures (1,276) (1,270)
Purchases of marketable securities (2,306) (9,625)
Maturities and sales of marketable securities 2,286 3,095
Net cash used in investing activities (1,296) (7,800)
Cash flows from financing activities:    
Repayments of long-term debt (334) (324)
Repayments of Long-term loan 1,219 1,219
Payments of employee restricted stock withholdings 325 344
Proceeds From Stock Options Exercised and Employee Stock Purchase Plan 146 197
Net cash used in financing activities (1,732) (1,690)
Effect of exchange rate changes on cash and cash equivalents (131) (624)
Net increase (decrease) in cash and cash equivalents 5,479 (6,910)
Cash and cash equivalents at beginning of period 22,719 25,289
Cash and cash equivalents at end of period $ 28,198 $ 18,379