Fair Value Measurements - Summary of Valuation of Company's Financial Instruments by Various Levels (Details) - Fair value, measurements, recurring - USD ($)	Jun. 27, 2021	Dec. 31, 2020
Assets:
Cash equivalents: money-market funds	$ 21,932,000	$ 1,934,000
Available-for-sale securities: U.S. treasuries	0	19,997,000
Foreign currency forward contracts	0	24,000
Total assets measured at fair value	21,932,000	21,955,000
Liabilities:
Foreign currency forward contracts	20,000	199,000
Total liabilities measured at fair value	20,000	199,000
Quoted market prices in active markets (Level 1)
Assets:
Cash equivalents: money-market funds	21,932,000	1,934,000
Available-for-sale securities: U.S. treasuries	0	19,997,000
Foreign currency forward contracts	0	0
Total assets measured at fair value	21,932,000	21,931,000
Liabilities:
Foreign currency forward contracts	0	0
Total liabilities measured at fair value	0	0
Significant other observable inputs (Level 2)
Assets:
Cash equivalents: money-market funds	0	0
Available-for-sale securities: U.S. treasuries	0	0
Foreign currency forward contracts	0	24,000
Total assets measured at fair value	0	24,000
Liabilities:
Foreign currency forward contracts	20,000	199,000
Total liabilities measured at fair value	20,000	199,000
Fair Value, Inputs, Level 3
Assets:
Total assets measured at fair value	0	0
Liabilities:
Total liabilities measured at fair value	$ 0	$ 0