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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income (loss) $ (1,385) $ (1,068)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Provision for doubtful accounts 391 74
Depreciation and amortization 6,232 3,410
Deferred income taxes (336) (227)
Gain (Loss) on Disposition of Property Plant Equipment 39 0
(Gain) Loss on Interest Rate Swaps (18) 17
Compensation expense related to stock-based awards and employee stock purchase plan 1,874 1,902
Changes in operating assets and liabilities:    
Accounts receivable 1,794 (3,251)
Inventories (2,082) (1,865)
Prepaid expenses and other assets (1,679) (120)
Other non-current assets 31 167
Accounts payable (3,397) (1,295)
Deferred revenue 1,135 2,179
Accrued expenses 2,312 1,250
Other long-term liabilities (7) 92
Net cash provided by operating activities 4,904 1,265
Cash flows from investing activities:    
Capital expenditures (3,492) (1,851)
Purchases of marketable securities (10,649) (9,287)
Maturities and sales of marketable securities 7,587 14,721
Net cash (used in) provided by investing activities (6,554) 3,583
Cash flows from financing activities:    
Repayments of long-term debt (3,088) (631)
Payments of employee restricted stock withholdings 344 482
Proceeds From Stock Options Exercised and Employee Stock Purchase Plan 190 375
Net cash used in financing activities (3,242) (738)
Effect of exchange rate changes on cash and cash equivalents 69 (107)
Net (decrease) increase in cash and cash equivalents (4,823) 4,003
Cash and cash equivalents at beginning of period 25,289 9,358
Cash and cash equivalents at end of period $ 20,466 $ 13,361