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