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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Changes in Accrued Liabilities Related to Fixed Asset Additions $ 1,452 $ 0
Deferred purchase price consideration related to asset acquisition included in accrued expenses 50 0
Cash flows from operating activities:    
Net income (loss) (6,911) (3,597)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Provision for doubtful accounts 294 434
Depreciation and amortization 5,477 6,255
Deferred income taxes 0 (1,060)
Gain (Loss) on Disposition of Property Plant Equipment 3 145
Loss on derivative instruments 0 241
Compensation expense related to stock-based awards and employee stock purchase plan 1,812 1,881
Foreign Currency Transaction Gain (Loss), Unrealized (119) 697
Changes in operating assets and liabilities:    
Accounts receivable 4,051 10,171
Inventories (2,661) (134)
Prepaid expenses and other current assets (49) (1,002)
Other non-current assets (577) (1,575)
Accounts payable 2,345 603
Deferred revenue 3,004 824
Accrued other 397 (4,957)
Other long-term liabilities (294) (74)
Net cash provided by operating activities 6,772 8,852
Cash flows from investing activities:    
Capital expenditures (6,809) (2,528)
Payments to Acquire Intangible Assets (50) 0
Purchases of marketable securities (7,348) (3,780)
Maturities and sales of marketable securities 19,286 3,740
Net cash provided by (used in) investing activities 5,079 (2,568)
Cash flows from financing activities:    
Repayments of long-term debt (1,561) (674)
Repayments of Long-term loan 8,200 2,437
Payments of employee restricted stock withholdings 392 313
Proceeds From Stock Options Exercised and Employee Stock Purchase Plan 1,268 119
Net cash used in financing activities (8,885) (3,305)
Effect of exchange rate changes on cash and cash equivalents 1,043 (912)
Net increase in cash and cash equivalents 4,009 2,067
Cash and cash equivalents at beginning of period 26,422 22,719
Cash and cash equivalents at end of period $ 30,431 $ 24,786