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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Operating activities    
Net income (loss) $ 9,031 $ (7,834)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 1,645 1,528
Write-down of assets held for sale to fair value 2,742
Deferred income taxes 113 (543)
Provision for doubtful accounts receivable 610 392
Gain on sale of property and equipment (18)
Stock-based compensation 3,686 3,796
Equity in the net loss of equity method investees 2,082 159
Gain on extinguishment of liability (164)
Change in assets and liabilities:    
Trade accounts receivable 6,648 2,275
Inventory (3,926) 1,128
Prepaid expenses 143 (3,150)
Other current assets and other assets 2,417 (2,127)
Trade accounts payable, accrued expenses and other current liabilities (4,404) 8,840
Due to IDT Corporation (138) 52
Income taxes payable (228) (1,320)
Net cash provided by operating activities 20,239 3,196
Investing activities    
Capital expenditures (575) (3,248)
Proceeds from sale of property and equipment 62
Payments for business acquisition, net of cash acquired (3,717)
Payments for intangible acquisition (745)
Investment in equity method investee (658) (1,275)
Investments in capitalized exploration costs-unproved oil and gas property (5,531)
Investments in notes receivable (1,225)
Cash transferred from Atid (209)
Repayment of notes receivable 80 446
Net cash used in investing activities (3,270) (13,325)
Financing activities    
Dividends paid (6,870) (6,674)
Purchase of equity of subsidiary (312)
Proceeds from sales of Class B common stock and warrants 6,000
Proceeds from revolving line of credit 14,450
Repayment of revolving line of credit (12,655)
Exercise of stock options 109
Repurchases of Class B common stock from employees (783) (829)
Net cash used in financing activities (1,653) (5,911)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash (36) 75
Net increase (decrease) in cash, cash equivalents, and restricted cash 15,280 (15,965)
Cash, cash equivalents, and restricted cash at beginning of period 31,927 47,052
Cash, cash equivalents, and restricted cash at end of period 47,207 31,087
Supplemental Schedule of Non-Cash Financing Activities    
Purchase of equity of subsidiary (see Note 10) (4,139)
Carrying value of assets contributed to New Atid (see Note 4) 1,000
Liability incurred for acquisitions 151
Class B common stock issued for GRE deferred units $ 1,886 $ 1,845