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Investments (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | May 17, 2017 | Mar. 14, 2017 | Aug. 15, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  |  |  |  |  |  |  | $ 0 | $ (220,000) |  |  |
Cash Paid for Investment |  |  |  |  |  |  |  |  | 6,000,000 | 2,250,000 |  |  |
Assets, Current | $ 201,472,000 |  |  |  | $ 139,695,000 |  |  |  | 201,472,000 | 139,695,000 |  |  |
Revenues | 49,203,000 | $ 13,725,000 | $ 6,485,000 | $ 62,093,000 | 3,458,000 | $ 36,633,000 | $ 16,457,000 | $ 8,854,000 | 131,506,000 | 65,402,000 |  |  |
Gain on Conversion of Loan and Accrued Interest |  |  |  |  |  |  |  |  | 0 | 2,671,000 |  |  |
Gain on exercise of Primary Warrant |  |  |  |  |  |  |  |  | 0 | 4,616,000 |  |  |
Change in fair value of investment |  |  |  |  |  |  |  |  | (59,103,000) | 42,239,000 |  |  |
Maximum Investment in Veritone |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000
Secured Promissory Note Advance |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000.0
Second Loan Warrant | 154,312 |  |  |  |  |  |  |  | 154,312 |  |  |  |
Secured Convertible Promissory Note |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000
Interest income and other |  |  |  |  |  |  |  |  | 969,000 | 1,605,000 |  |  |
Loss on fair value investment net |  |  |  |  |  |  |  |  | (78,198,000) | 49,526,000 |  |  |
Assets | 223,949,000 |  |  |  | 308,768,000 |  |  |  | 223,949,000 | 308,768,000 |  |  |
Liabilities, Current | 31,035,000 |  |  |  | 9,557,000 |  |  |  | 31,035,000 | 9,557,000 |  |  |
Liabilities | 32,709,000 |  |  |  | 13,109,000 |  |  |  | 32,709,000 | 13,109,000 |  |  |
Stockholders' Equity Attributable to Parent | $ 189,393,000 |  |  |  | $ 294,301,000 |  |  |  | $ 189,393,000 | $ 294,301,000 |  |  |
Common stock, shares outstanding | 49,639,319 |  |  |  | 50,639,926 |  |  |  | 49,639,319 | 50,639,926 |  |  |
Debt Instrument, Convertible, Conversion Price |  |  |  |  |  |  |  |  |  |  | $ 13.61 |  |
Primary warrant shares |  |  |  |  |  |  |  |  |  |  | 2,150,335 |  |
Cash paid for primary warrant exercise |  |  |  |  |  |  |  |  |  |  | $ 29,300,000 |  |
10% Warrant |  |  |  |  |  |  |  |  |  |  | 809,400 |  |
Bridge Installment Shares | 445,440 |  |  |  |  |  |  |  | 445,440 |  |  |  |
Bridge Warrant Share |  |  |  |  |  |  |  |  |  |  |  | 156,720 |
Fair Value Investment - Shares sold |  |  |  |  |  |  |  |  | 2,700,000 |  |  |  |
Investments at fair value | $ 7,459,000 |  |  |  | $ 104,754,000 |  |  |  | $ 7,459,000 | $ 104,754,000 |  |  |
Equity Method Investment, Ownership Percentage | 22.60% |  |  |  |  |  |  |  | 22.60% |  |  |  |
Percentage of ownership, Miso Robotics | 30.00% |  |  |  |  |  |  |  | 30.00% |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share | $ 10.44 |  |  |  |  |  |  |  | $ 10.44 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share | $ 4.95 |  |  |  |  |  |  |  | $ 4.95 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares | 1,419,521 |  |  |  |  |  |  |  | 1,419,521 |  | 4,119,521 |  |
Investments at fair value | $ 5,395,000 |  |  |  |  |  |  |  | $ 5,395,000 |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares |  |  |  |  |  |  |  |  |  |  | 1,120,432 |  |
Investments at fair value | $ 2,064,000 |  |  |  |  |  |  |  | 2,064,000 |  |  |  |
Veritone Loans [Member] | Veritone [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  |  |  |  |  |  |  | 1,523,746 |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of investment |  |  |  |  |  |  |  |  | (11,895,000) | 8,317,000 |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of investment |  |  |  |  |  |  |  |  | (47,208,000) | $ 33,922,000 |  |  |
Realized Investment Gains (Losses) |  |  |  |  |  |  |  |  | $ 19,100,000 |  |  |  |

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