Stockholders' Deficit - Additional Information (Detail)			12 Months Ended			84 Months Ended
	Apr. 30, 2021 USD ($)	Mar. 09, 2021 $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Feb. 01, 2022 $ / shares shares
Class Of Stock [Line Items]
Common stock, shares authorized (in shares)			500,000,000	500,000,000		500,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001	$ 0.0001	$ 0.0001		$ 0.0001
Preferred stock, shares authorized (in shares)			20,000,000			20,000,000
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.0001			$ 0.0001
Common stock, shares issued (in shares)			397,830,044	382,243,142		397,830,044
Common stock, shares outstanding (in shares)			397,830,044	382,243,142		397,830,044
Treasury stock, shares outstanding (in shares)			163,800	163,800		163,800
Proceeds from equity offering, net of issuance costs paid | $			$ 164,530,000	$ 86,302,000	$ 30,000,000
Issuance of shares under ATM (in shares)			13,295,817
Sale of stock issued in transaction (in dollars per share) | $ / shares				$ 9.50
Subsequent Event
Class Of Stock [Line Items]
Common stock, shares authorized (in shares)							900,000,000
Common stock, par value (in dollars per share) | $ / shares							$ 0.0001
Public Stock Offering
Class Of Stock [Line Items]
Sale of stock issued in transaction (in shares)				8,521,500
Sales of stock issued in transaction | $				$ 90,700,000
Stock issuance costs | $				$ 4,373,000
Public Stock Offering - Shares Issued to the Public
Class Of Stock [Line Items]
Sale of stock issued in transaction (in shares)				4,811,500
Public Stock Offering - Shares Issued to Executive
Class Of Stock [Line Items]
Sale of stock issued in transaction (in shares)				3,710,000
Sale of stock issued in transaction (in dollars per share) | $ / shares				$ 12.12
Over-Allotment Option
Class Of Stock [Line Items]
Sale of stock issued in transaction (in shares)				1,111,500
Private Placement
Class Of Stock [Line Items]
Sale of stock issued in transaction (in shares)					2,047,500
Sale of stock issued in transaction (in dollars per share) | $ / shares					$ 14.66
Sales of stock issued in transaction | $					$ 30,000,000
ATM Offering Program
Class Of Stock [Line Items]
Proceeds from equity offering, net of issuance costs paid | $			$ 164,500,000
Available for future stock issuance | $			330,800,000			$ 330,800,000
ATM Offering Program | Maximum
Class Of Stock [Line Items]
Maximum aggregate offering price | $	$ 500,000,000
Percentage of sales agent commission	3.00%
2015 Share Repurchase Plan
Class Of Stock [Line Items]
Stock repurchase program, authorized amount | $			$ 50,000,000			$ 50,000,000
Repurchase of common stock, shares (in shares)			0	0	473,586	6,403,489
Repurchase of common stock, value | $					$ 500,000	$ 31,700,000
Remaining authorized repurchase amount | $			$ 18,300,000			$ 18,300,000
Stock Transfer Agreement
Class Of Stock [Line Items]
Repurchase of common stock, shares (in shares)					204,750
Repurchase of common stock, value | $					$ 2,000,000
Stock repurchased (in dollars per share) | $ / shares					$ 9.77
NantCell
Class Of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares		$ 0.001
Merger exchange ratio		0.8190
Shares issued (in shares)		273,700,000