Investments Investments (Details) - USD ($)		3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	May 17, 2017	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Mar. 14, 2017	Aug. 15, 2016
Investment [Line Items]
Maximum Investment in Veritone										$ 50,000,000
Secured Convertible Promissory Note										20,000,000
Secured Promissory Note Advance										$ 10,000,000
Time-sharing Transactions, Stated Interest Rate for Notes Receivable										6.00%
First Loan Warrant										$ 700,000
Debt Instrument, Convertible, Conversion Price	$ 13.6088
Loan receivable and accrued interest	$ 20,736,000	$ 0				$ 0		$ 18,616,000
Common stock, shares outstanding		50,604,782				50,604,782		50,476,042
Veritone Primary Warrant										$ 50,000,000
Cash paid for primary warrant exercise	$ 29,300,000
10% Warrant	809,400
Veritone Bridge Loan	$ 4,000,000								$ 4,000,000
Bridge loan stated interest rate									8.00%
Veritone Bridge Loan Advance 1									$ 1,000,000
Veritone Bridge Loan Advance 3 and 4									$ 2,000,000
Upfront Shares									60,000
Bridge Installment Shares									90,000
Bridge Warrant Share									157,000
Unamortized loan discount	$ 1,700,000
Accretion (Amortization) of Discounts and Premiums, Investments						$ 630,000
Investments at fair value		$ 208,796,000				208,796,000		$ 0
Gain on Conversion of Loan and Accrued Interest		0		$ 0		2,671,000	$ 0
Gain on exercise of warrant		0		0		4,616,000	0
Change in fair value of warrants		31,829,000				30,900,000
Unrealized Gain (Loss) on Investments		127,150,000				115,381,000
Loss on fair value investment net		158,979,000				153,568,000
Net Income (Loss) Available to Common Stockholders, Diluted		$ 158,326,000		$ 7,043,000		$ 132,143,000	$ (43,456,000)
Earnings Per Share, Basic		$ 3.13		$ 0.14		$ 2.62	$ (0.87)
Assets, Current		$ 162,388,000				$ 162,388,000		188,490,000
Total assets		441,210,000				441,210,000		296,003,000
Current liabilities		27,515,000				27,515,000		28,191,000
Total liabilities		36,267,000				36,267,000		28,560,000
Stockholders' Equity Attributable to Parent		$ 403,488,000				$ 403,488,000		265,589,000
Cash Paid for Investment								2,250,000
Equity Method Investment, Ownership Percentage		23.00%				23.00%
Equity in earnings (losses) of investee		$ 116,000		$ 0		$ 130,000	$ 0
Minimum [Member]
Investment [Line Items]
Receivable with Imputed Interest, Effective Yield (Interest Rate)						9.00%
Maximum [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Volatility Rate						50.00%
Fair Value Inputs, Probability of Default						75.00%
Fair value inputs recovery						100.00%
Receivable with Imputed Interest, Effective Yield (Interest Rate)						53.00%
Veritone [Member]
Investment [Line Items]
Investment Income, Interest						$ 471,000
Revenues			$ 4,087,000		$ 7,195,000
Gross Profit			3,751,000		6,663,000
Operating Expenses			11,599,000		21,142,000
Other Operating Income (Expense), Net			(13,746,000)		(12,960,000)
Net Income (Loss) Available to Common Stockholders, Diluted			$ (24,992,000)		$ (31,912,000)
Earnings Per Share, Basic			$ (2,940)		$ (5,820)
Assets, Current			$ 88,831,000		$ 88,831,000			21,367,000
Noncurrent assets			440,000		440,000			981,000
Total assets			89,271,000		89,271,000			22,348,000
Current liabilities			33,746,000		33,746,000			44,501,000
Noncurrent liabilities			18,000		18,000			22,000
Total liabilities			33,764,000		33,764,000			44,523,000
Preferred Stock, Value, Outstanding			0		0			23,350,000
Stockholders' Equity Attributable to Parent			55,507,000		55,507,000			(45,525,000)
Total liabilities, preferred stock and stockholders' equity			$ 89,271,000		$ 89,271,000			$ 22,348,000
Common Stock [Member]
Investment [Line Items]
Investments at fair value		172,254,000				172,254,000
Warrant [Member]
Investment [Line Items]
Investments at fair value		$ 36,542,000				$ 36,542,000
Veritone Loans [Member] | Veritone [Member]
Investment [Line Items]
Common stock, shares outstanding	1,523,746
Primary warrant [Member] | Veritone [Member]
Investment [Line Items]
Common stock, shares outstanding	2,150,335
Bridge Loan [Member] | Veritone [Member]
Investment [Line Items]
Common stock, shares outstanding	295,440
Finnerty - Common Stock [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Volatility Rate	35.00%					100.00%
Fair Value Inputs, Discount for Lack of Marketability	6.00%					8.00%
Fair Value Assumptions, Expected Term	6 months					45 days
Monte Carlo [Member] | Minimum [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Volatility Rate						40.00%
Fair Value Inputs, Probability of Default						25.00%
Fair Value Inputs, Discount for Lack of Marketability						7.00%
Finnerty [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Term						4 years 11 months
Finnerty [Member] | Minimum [Member]
Investment [Line Items]
Fair Value Inputs, Discount for Lack of Marketability						25.00%
Finnerty [Member] | Maximum [Member]
Investment [Line Items]
Fair Value Inputs, Discount for Lack of Marketability						30.00%
Black Scholes [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Dividend Payments						$ 0
Black Scholes [Member] | Minimum [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Volatility Rate						45.00%
Fair Value Assumptions, Risk Free Interest Rate						1.62%
Fair Value Assumptions, Expected Term						3 years
Black Scholes [Member] | Maximum [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Volatility Rate						55.00%
Fair Value Assumptions, Risk Free Interest Rate						2.33%
Fair Value Assumptions, Expected Term						10 years
Finnerty - Warrants [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Volatility Rate	35.00%					45.00%
Fair Value Inputs, Discount for Lack of Marketability	6.00%					5.00%
Fair Value Assumptions, Expected Term	6 months
Finnerty - Warrants [Member] | Minimum [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Term						3 months
Finnerty - Warrants [Member] | Maximum [Member]
Investment [Line Items]
Fair Value Assumptions, Expected Term						6 months