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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Changes in Accrued Liabilities Related to Fixed Asset Additions | $ 624 | $ 1,452
Deferred purchase price consideration related to asset acquisition included in accrued expenses | 0 | 50
Cash flows from operating activities: |  |
Net income (loss) | (5,236) | (6,911)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities: |  |
Provision for doubtful accounts | 129 | 294
Depreciation and amortization | 6,288 | 5,477
Deferred income taxes | 24 | 0
Gain (Loss) on Disposition of Property Plant Equipment | 0 | 3
Compensation expense related to stock-based awards and employee stock purchase plan | 1,592 | 1,812
Unrealized currency translation gain | (212) | (119)
Changes in operating assets and liabilities: |  |
Accounts receivable | (1,719) | 4,051
Inventories | (137) | (2,661)
Prepaid expenses, other current assets, and current contract assets | 230 | (49)
Other non-current assets and non-current contract assets | (1,252) | (577)
Accounts payable | 908 | 2,345
Deferred revenue, contract liabilities, and long-term contract liabilities | 527 | 3,004
Accrued compensation, product warranty, and other | (2,331) | 397
Other long-term liabilities | (9) | (294)
Net cash (used in) provided by operating activities | (1,198) | 6,772
Cash flows from investing activities: |  |
Capital expenditures | (7,461) | (6,809)
Cash paid for acquisition of intangible asset | 0 | (50)
Purchases of marketable securities | (2,036) | (7,348)
Maturities and sales of marketable securities | 10,020 | 19,286
Net cash provided by investing activities | 523 | 5,079
Cash flows from financing activities: |  |
Repayments of long-term debt | (89) | (1,561)
Payments of employee restricted stock withholdings | 0 | 392
Proceeds From Stock Options Exercised and Employee Stock Purchase Plan | 101 | 1,268
Repayments of Long-term loan | 3,400 | 8,200
Proceeds from Sale of Treasury Stock | 4,500 | 0
Repayments of Long-term Capital Lease Obligations | (258) | 0
Net cash provided by (used in) financing activities | 854 | (8,885)
Effect of exchange rate changes on cash and cash equivalents | (238) | 1,043
Net (decrease) increase in cash and cash equivalents | (59) | 4,009
Cash and cash equivalents at beginning of period | 34,596 | 26,422
Cash and cash equivalents at end of period | $ 34,537 | $ 30,431

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration