Convertible Notes - Narrative (Details)						1 Months Ended	12 Months Ended
	Dec. 15, 2021 USD ($)	May 25, 2021 USD ($)	Apr. 27, 2021 USD ($) day $ / shares shares	Apr. 14, 2021 USD ($) $ / shares shares	Apr. 13, 2021 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)		Jan. 01, 2021 USD ($)	Dec. 31, 2017 USD ($)	Dec. 21, 2016
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes, net of offering costs							$ 75,000,000	$ 0	[1]
Repayment of convertible notes							97,000,000	0	[1]
Loss on Exchange and Prepayment of 2016 Notes							742,000	0	[1]
Cambridge purchase agreement
Debt Instrument [Line Items]
Number of shares related party promissory note converted | shares				1,689,189
Highbridge Capital Management Agreement
Debt Instrument [Line Items]
Number of shares related party promissory note converted | shares				1,926,781
Convertible debt
Debt Instrument [Line Items]
Interest rate on debt (in percentage)			4.50%			5.50%						5.50%
Face value of debt						$ 107,000,000
Proceeds from issuance of convertible notes, net of offering costs						102,714,000
Initial purchasers' discount and debt issuance costs						4,286,000
Carrying value of convertible notes on date of issuance							$ 136,871,000	$ 99,989,000
Effective interest rate							6.78%
Amount of convertible debt converted					$ 10,000,000
Repayment of convertible notes	$ 9,500,000
Loss on Exchange and Prepayment of 2016 Notes		$ 412,000
Decrease in debt discount and deferred financing offering costs		412,000
Convertible debt | Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
Carrying value of convertible notes on date of issuance										$ 5,746,000
Convertible debt | Initial purchasers agreement
Debt Instrument [Line Items]
Face value of debt						90,000,000
Proceeds from issuance of convertible notes, net of offering costs						92,797,000
Initial purchasers' discount and debt issuance costs		1,358,000			644,000
Repayment of convertible notes		$ 55,555,000			31,945,000
Loss on Exchange and Prepayment of 2016 Notes					267,000
Convertible debt | Cambridge purchase agreement
Debt Instrument [Line Items]
Face value of debt											$ 10,000,000
Proceeds from issuance of convertible notes, net of offering costs						9,917,000
Amount of convertible debt converted	$ 5,000,000				5,000,000
Convertible notes payable					5,000,000		$ 10,000,000
Accrued and unpaid interest					$ 91,000
Number of shares related party promissory note converted | shares					1,689,189
Conversion price of convertible debt (usd per share) | $ / shares					$ 2.96
Decrease to unamortized debt discount and deferred financing offering costs					$ 18,000
Loss on Exchange and Prepayment of 2016 Notes					18,000
Convertible debt | Pursuant to the exercise of the overallotment by the Initial Purchasers
Debt Instrument [Line Items]
Face value of debt						$ 7,000,000
Convertible debt | Highbridge Capital Management Agreement
Debt Instrument [Line Items]
Initial purchasers' discount and debt issuance costs				$ 44,000
Convertible notes payable					$ 5,000,000		36,945,000
Accrued and unpaid interest				$ 92,000
Number of shares related party promissory note converted | shares				1,926,781
Conversion price of convertible debt (usd per share) | $ / shares				$ 2.595
Convertible debt | Four Point Five Zero Percent Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Interest rate on debt (in percentage)			4.50%		4.50%
Face value of debt					$ 137,500,000		$ 137,500,000
Effective interest rate			4.61%
Conversion price of convertible debt (usd per share) | $ / shares			$ 3.85
Net proceeds from debt offering			$ 136,772,000
Deferred financing offering costs			$ 610,000
Shares converted per dollar (in shares) | shares			259.8753
Threshold percentage of stock price trigger (in percentage)			130.00%
Threshold of trading days | day			20
Threshold consecutive trading days | day			30
Redemption price as a percentage of principal			100.00%
Threshold percentage of principal (in percentage)			100.00%
Principal outstanding to restrict future indebtedness			$ 25,000,000
Remaining term							52 months
Convertible debt | Four Point Five Zero Percent Convertible Senior Notes Due 2026 | Nant Capital
Debt Instrument [Line Items]
Net proceeds from debt offering			62,223,000
Convertible debt | Four Point Five Zero Percent Convertible Senior Notes Due 2026 | Highbridge Capital Management
Debt Instrument [Line Items]
Net proceeds from debt offering			74,549,000
Deferred financing offering costs			$ 118,000

[1] The statements for the year ended December 31, 2020 includes the Connected Care Business (see Note 4).