Related Party Transactions (Details)									3 Months Ended					9 Months Ended
		Jul. 22, 2020 USD ($)	Aug. 08, 2018 USD ($)	Jun. 01, 2016 USD ($) shares	Mar. 08, 2016 USD ($)	Jan. 22, 2016 USD ($)	Jan. 04, 2016 USD ($) $ / shares	Jun. 19, 2015 USD ($) test term	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)		Dec. 31, 2019 USD ($)	Dec. 31, 2016 USD ($)	Dec. 21, 2016 USD ($)	Dec. 15, 2016 USD ($)
Related Party Transaction [Line Items]
Related party receivables									$ 2,189,000					$ 2,189,000			$ 1,931,000
Related party payables, net of receivables balances including related party liabilities									33,971,000					33,971,000			28,347,000
Accrued and unpaid interest on convertible notes									1,619,000					1,619,000			274,000
Related party promissory note									112,666,000					112,666,000			112,666,000
Revenue									18,765,000		$ 18,604,000			54,530,000	$ 58,865,000
Net loss attributable to NantHealth for basic and diluted net loss per share									(11,000,000)	$ (48,289,000)	(16,377,000)	$ (14,713,000)	$ (19,923,000)	(36,224,000)	(51,013,000)	[1]
Payments to Acquire Businesses, Net of Cash Acquired	[1]													5,475,000	0
OpenNMS Assignment
Related Party Transaction [Line Items]
Finite lived intangible asset acquired in assignment		$ 5,200,000
Convertible Debt
Related Party Transaction [Line Items]
Face value of debt									107,000,000					107,000,000			107,000,000	$ 107,000,000	$ 107,000,000
Equity Method Investee | OpenNMS Assignment
Related Party Transaction [Line Items]
Finite lived intangible asset acquired in assignment		4,553,000
Cash paid in business acquisition		$ 5,577,000
Percentage of voting interest acquired		91.00%
Revenue									361,000
Net loss attributable to NantHealth for basic and diluted net loss per share									(467,000)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		5 years 10 months 24 days
Business Acquisition, Percentage Owned By Noncontrolling Interest		9.00%
Equity Method Investee | OpenNMS Assignment | Call Option
Related Party Transaction [Line Items]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		$ 56,769
Payments to Acquire Businesses, Net of Cash Acquired		278,000
Equity Method Investee | OpenNMS Assignment | Developed technology
Related Party Transaction [Line Items]
Finite lived intangible asset acquired in assignment		$ 2,500,000
Estimated lives of definite-lived intangible assets		6 years
Equity Method Investee | OpenNMS Assignment | Installed user base
Related Party Transaction [Line Items]
Finite lived intangible asset acquired in assignment		$ 1,400,000
Estimated lives of definite-lived intangible assets		6 years
Equity Method Investee | OpenNMS Assignment | Customer relationships
Related Party Transaction [Line Items]
Finite lived intangible asset acquired in assignment		$ 1,000,000
Estimated lives of definite-lived intangible assets		6 years
Equity Method Investee | OpenNMS Assignment | Trade name
Related Party Transaction [Line Items]
Finite lived intangible asset acquired in assignment		$ 300,000
Estimated lives of definite-lived intangible assets		4 years
Receivable from Ziosoft KK related to sale of Qi Imaging | Affiliated Entity
Related Party Transaction [Line Items]
Related party receivables									1,477,000					1,477,000			1,658,000
Reseller agreement
Related Party Transaction [Line Items]
Related Party Transaction, Agreement Term								5 years 6 months
Reseller agreement | Equity Method Investee
Related Party Transaction [Line Items]
Number of renewals | term								3
Renewal term								3 years
Number of tests to qualify for first renewal option | test								300,000
Number of tests to qualify for second renewal option | test								570,000
Number of tests to qualify for third renewal option | test								760,000
Annual minimum fees, tier one								$ 2,000,000
Annual minimum fees, tier two								25,000,000
Annual minimum fees, tier three								$ 50,000,000
Related party payables									3,000					3,000			197,000
Cost of revenue									3,000		105,000			48,000	1,852,000
Cambridge Purchase Agreement | Affiliated Entity | Convertible Debt
Related Party Transaction [Line Items]
Face value of debt																				$ 10,000,000
Accrued and unpaid interest on convertible notes									162,000					162,000			24,000
Liquid Tumor Profiling Services Agreement
Related Party Transaction [Line Items]
Related party receivables									110,000					110,000			110,000
Revenue from related parties									0		43,000			0	459,000
Promissory Notes With NantCapital | Affiliated Entity
Related Party Transaction [Line Items]
Accrued and unpaid interest on convertible notes									29,364,000					29,364,000			24,227,000
Related party promissory note							$ 112,666,000		142,030,000					142,030,000			$ 136,893,000
Interest bearing on related promissory note							5.00%
Per share price of stock shares to repay debt (usd per share) | $ / shares							$ 18.6126
Per share price of shares to settle debt (usd per share) | $ / shares							$ 1.484
Promissory Notes With NantOmics | Equity Method Investee
Related Party Transaction [Line Items]
Related party promissory note						$ 20,000,000			0					0
Interest bearing on related promissory note						5.00%
Additional advance on related party promissory note					$ 20,000,000
Amount of principal and interest under promissory note converted to shares				$ 40,590,000
Number of shares related party promissory note converted (in shares) | shares				2,899,297
Promissory Note 9.75%, Due June 15, 2022 | Affiliated Entity
Related Party Transaction [Line Items]
Related party promissory note			$ 100,000,000
Interest bearing on related promissory note			9.75%
Maximum advances available through March 2019			$ 10,000,000
Maximum advances available after March 2019 until maturity			$ 20,000,000
Percentage profit measure deviation allowed			25.00%
NantWorks | Shared services agreement | Affiliated Entity
Related Party Transaction [Line Items]
Income from related parties									$ (34,000)
Net selling, general, and administrative service expenses incurred related to services provided by related parties											$ 20,000			$ 56,000	$ 834,000

[1] The statements for the nine months ended September 30, 2020 and 2019 include the Connected Care Business (see Note 4).