Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) Customer	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($) Customer	Sep. 30, 2021 USD ($) Customer	Sep. 30, 2020 USD ($) Customer	Dec. 31, 2020 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items]
Receivables from contract with customers	$ 120,822,000			$ 120,822,000		$ 183,857,000
Contract liability	7,879,000			7,879,000		26,576,000
Contract with customer liability, revenue recognized	5,700,000		$ 252,000	$ 26,400,000	$ 254,000
Practical expedient not to disclose amount of transaction price allocated to unsatisfied performance obligations				true
Reagents and supplies	21,950,000			$ 21,950,000		16,491,000
Provision for credit losses for accounts receivable	848,000			4,107,000	$ 441,000
Redeemable preferred stock investment	$ 20,000,000			20,000,000
Preferred stock, redemption date	Jul. 31, 2027
Stockholders' equity	$ 1,036,780,000			$ 1,036,780,000		569,387,000
Cumulative tax effect		$ 239,000
Accounting Standards Update [Extensible Enumeration]				ASU 2016-13
Accounting standards update, adopted	true			true
Accounting standards update, immaterial effect	true			true
Retained Earnings (Accumulated Deficit)
Summary Of Significant Accounting Policies [Line Items]
Cumulative tax effect		$ 239,000
2019-12
Summary Of Significant Accounting Policies [Line Items]
Accounting standards update, adopted	true			true
Accounting standards update, immaterial effect	true			true
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 | Retained Earnings (Accumulated Deficit)
Summary Of Significant Accounting Policies [Line Items]
Stockholders' equity	$ 887,000			$ 887,000
Other Current Assets
Summary Of Significant Accounting Policies [Line Items]
Contract assets from contract with customers	$ 206,000			206,000		$ 1,400,000
Other Long-Term Assets | Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 | Retained Earnings (Accumulated Deficit)
Summary Of Significant Accounting Policies [Line Items]
Cumulative tax effect				$ 239,000
Customer Concentration Risk | Revenue
Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer	2		1	1	1
Customer Concentration Risk | Revenue | Customer One
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	31.00%		37.00%	26.00%	35.00%
Customer Concentration Risk | Revenue | Customer Two
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	11.00%
Customer Concentration Risk | Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer				0		0
Customer Concentration Risk | Accounts Receivable | Minimum
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage				10.00%		10.00%