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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (3,893) $ (4,885)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Provision for doubtful accounts 28 74
Depreciation and amortization 3,050 2,761
Deferred income taxes 9 0
Loss on sale of fixed assets 0 3
Compensation expense related to stock-based awards and employee stock purchase plan 853 960
Unrealized currency translation loss 40 12
Changes in operating assets and liabilities:    
Accounts receivable (91) 4,160
Inventories (558) (1,009)
Prepaid expenses, other current assets, and current contract assets (651) (203)
Other non-current assets and non-current contract assets (836) (269)
Accounts payable 1,067 1,724
Deferred revenue, contract liabilities, and long-term contract liabilities 1,094 454
Accrued compensation, product warranty, and other (1,303) 849
Other long-term liabilities (6) (286)
Net cash (used in) provided by operating activities (1,197) 4,345
Cash flows from investing activities:    
Capital expenditures (3,189) (2,047)
Cash paid for acquisition of intangible asset 0 (50)
Purchases of marketable securities (1,026) (1,385)
Maturities and sales of marketable securities 6,013 10,354
Net cash provided by investing activities 1,798 6,872
Cash flows from financing activities:    
Repayments of long-term debt (44) (1,518)
Repayments of term note borrowings 2,825 7,625
Payment of employee restricted stock withholdings 0 392
Proceeds from stock options exercised and employee stock purchase plan 0 1,060
Sale of treasury stock 4,500 0
Payment of capital lease (107) 0
Net cash provided by (used in) financing activities 1,524 (8,475)
Effect of exchange rate changes on cash and cash equivalents 1,047 221
Net increase in cash and cash equivalents 3,172 2,963
Cash and cash equivalents at beginning of period 34,596  
Cash and cash equivalents at end of period 37,768 29,385
Changes in accrued other and accounts payable related to property and equipment additions 537 169
Deferred purchase price consideration related to asset acquisition included in accrued expenses $ 0 $ 50