Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021 USD ($) Letter Segment	Dec. 31, 2020 USD ($) Letter	Dec. 28, 2019 USD ($)
Letters of credit outstanding	$ 500,000	$ 500,000
Number of letters of credit maintained | Letter	2	2
Restricted cash non-current	$ 500,000	$ 500,000
Cash, cash equivalents and restricted cash	26,080,000	25,081,000	$ 20,592,000
Allowance for credit losses	0	0
Provisions for credit losses	0	0
Write off accounts receivable balances	0	0
Impairment losses on long-lived assets	0	0
Capitalized software development costs	0	0
Provision for loss on contracts	0
Credit losses	$ 0	0
Number of operating segments | Segment	1
Term of product warranties	1 year
Product warranty description	The Company provides a one-year warranty on its OCS Consoles and disposable sets and replaces or repairs any OCS Console or disposable set that does not function in accordance with the product specifications
Contract with customer, asset, after allowance for credit loss	$ 0	0
Performance obligations totaled	1,400,000
Operating lease right-of-use assets	5,847,000
Lease liabilities	8,604,000
ASU No. 2016-02
Operating lease right-of-use assets	6,700,000
Lease liabilities	$ 8,400,000
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, immaterial effect	true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2021
ASU No. 2016-13
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, immaterial effect	true
ASU No. 2019-12
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, immaterial effect	true
Other Income (Expense) [Member]
Foreign currency transaction gains (losses)	$ (1,000,000.0)	1,000,000.0
Maximum [Member]
Product warranty accrual	$ 100,000	$ 100,000
Performance obligations satisfaction period	1 year
Customer Concentration Risk [Member] | Revenue [Member] | Significant Customer Benchmark [Member] | Minimum [Member]
Concentration risk percentage	10.00%
Customer Concentration Risk [Member] | Revenue [Member] | Customer One [Member]
Concentration risk percentage	11.00%	14.00%
Customer Concentration Risk [Member] | Revenue [Member] | Customer Two [Member]
Concentration risk percentage		10.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Significant Customer Benchmark [Member] | Minimum [Member]
Concentration risk percentage	10.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member]
Concentration risk percentage	21.00%	30.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member]
Concentration risk percentage	15.00%