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Consolidated Statements of Cash Flows - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]      
Consolidated net income (loss) $ (217,570,000) $ (111,922,000) $ 11,248,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation of fixed assets 26,411,000 28,848,000 27,283,000
Amortization of intangible assets 5,286,000 3,999,000 3,968,000
Stock-based compensation to employees and directors 14,356,000 4,077,000 4,891,000
Deferred income taxes, net (2,386,000) 65,199,000 7,719,000
Gain on investment in precious metals 0 (1,971,000) (201,000)
Gain on sale of cryptocurrencies (8,370,000) (1,995,000) 0
Impairment of cryptocurrencies 10,463,000 0 0
Loss on equity investments, net 2,828,000 5,995,000 2,850,000
Loss on disposal of business and other asset abandonments 3,565,000 0 0
Impairment on indefinite-lived intangible assets 6,000,000 0 0
Early extinguishment costs of long-term debts 283,000 2,464,000 0
Other 711,000 368,000 356,000
Changes in operating assets and liabilities, net of acquisitions:      
Accounts receivable, net (5,558,000) (1,938,000) (10,006,000)
Inventories, net 628,000 5,234,000 1,105,000
Prepaids and other current assets (3,622,000) (2,799,000) 1,588,000
Other long-term assets, net (2,870,000) (2,307,000) (786,000)
Accounts payable 16,499,000 (20,995,000) (18,823,000)
Accrued liabilities 5,661,000 (12,311,000) 16,936,000
Deferred revenue 9,150,000 4,688,000 (9,164,000)
Other long-term liabilities (399,000) 145,000 600,000
Net cash provided by (used in) operating activities (138,934,000) (35,221,000) 39,564,000
Cash flows from investing activities:      
Proceeds from sale of precious metals 0 11,917,000 1,610,000
Investment in precious metals 0 0 (1,633,000)
Purchase of intangible assets (9,597,000) (423,000) 0
Investment in equity securities (48,731,000) (5,188,000) (4,750,000)
Disbursement of note receivable (3,059,000) (750,000) (3,668,000)
Acquisitions of businesses, net of cash acquired (12,912,000) 0 1,248,000
Deposit on purchase of a business (8,000,000) 0 0
Expenditures for fixed assets, including internal-use software and website development (28,680,000) (23,586,000) (72,281,000)
Other 56,000 70,000 27,000
Net cash used in investing activities (110,923,000) (17,960,000) (79,447,000)
Cash flows from financing activities:      
Payments on capital lease obligations (496,000) (83,000) 0
Paydown on direct financing arrangement 0 0 (54,000)
Payments on finance obligations 0 (15,316,000) (1,906,000)
Payments on interest swap 0 (1,535,000) (563,000)
Proceeds from finance obligations 0 0 11,399,000
Payments on long-term debt (40,000,000) (45,766,000) 0
Proceeds from long-term debt 0 40,000,000 36,273,000
Payments of preferred dividends (77,000) (109,000) 0
Proceeds from issuance and exercise of stock warrants 50,588,000 106,462,000 0
Proceeds from exercise of stock options 0 664,000 819,000
Proceeds from rights offering, net of offering costs 0 0 7,591,000
Proceeds from security token offering, net of offering costs and withdrawals 82,354,000 905,000 0
Proceeds from sale of common stock, net of offering costs 94,554,000 0 0
Paid in capital for noncontrolling interest 6,700,000 0 0
Purchase of treasury stock 0 (10,000,000) 0
Payments of taxes withheld upon vesting of restricted stock (4,622,000) (1,229,000) (840,000)
Payment of debt issuance costs 0 (670,000) 0
Net cash provided by financing activities 189,001,000 73,323,000 52,719,000
Net increase (decrease) in cash and cash equivalents (60,856,000) 20,142,000 12,836,000
Cash, cash equivalents and restricted cash, beginning of year 203,670,000 183,528,000 170,692,000
Cash, cash equivalents and restricted cash, end of year 142,814,000 203,670,000 183,528,000
Cash paid during the period:      
Interest paid, net of amounts capitalized 1,319,000 2,940,000 1,269,000
Income taxes paid (refunded), net (726,000) 487,000 1,338,000
Non-cash investing and financing activities:      
Fixed assets, including internal-use software and website development costs, financed through accounts payable and accrued liabilities 139,000 989,000 2,219,000
Equipment acquired under capital lease obligations 0 1,421,000 0
Capitalized interest cost 0 0 105,000
Acquisition of assets through stock issuance 4,430,000 0 0
Change in fair value of cash flow hedge 0 (1,738,000) (659,000)
Note receivable converted to equity investment $ 200,000 $ 1,368,000 $ 2,850,000