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The Company and Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Nov. 10, 2021
USD ($)
shares
Nov. 03, 2021
Feb. 22, 2021
USD ($)
shares
Jun. 16, 2020
USD ($)
shares
Nov. 25, 2019
USD ($)
$ / shares
shares
Nov. 06, 2019
Oct. 16, 2019
$ / shares
shares
Dec. 31, 2021
USD ($)
Distributor
Customer
$ / shares
shares
Dec. 31, 2020
USD ($)
Customer
Distributor
$ / shares
shares
Dec. 31, 2019
USD ($)
Customer
Distributor
shares
Significant Accounting Policies [Line Items]                    
Stock split             30,000-for-1      
Common stock, shares authorized | shares             200,000,000 200,000,000 200,000,000  
Common stock, par value | $ / shares             $ 0.0001 $ 0.0001 $ 0.0001  
Reverse stock split           2-for-3        
Foreign currency remeasurement and transactions gains and losses               $ 500,000 $ 100,000  
Fair value, assets, level 1 to level 2 transfers, amount               0 0  
Fair value, assets, level 2 to level 1 transfers, amount               0 0  
Fair value, liabilities, level 1 to level 2 transfers, amount               0 0  
Fair value, liabilities, level 2 to level 1 transfers, amount               0 0  
Finance leases               $ 0    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]               Liabilities    
Accrued expenses and other current liabilities               $ 24,282,000 12,963,000  
Reduction of research and development expense               $ 2,400,000 0  
Earnings per share, potentially dilutive securities | shares               2,138,000    
Selling, General and Administrative Expenses                    
Significant Accounting Policies [Line Items]                    
Advertising expenses               $ 1,500,000 $ 300,000 $ 300,000
Non-recurring Engineering Services                    
Significant Accounting Policies [Line Items]                    
Accrued expenses and other current liabilities               5,700,000    
Accrued expenses and other non current liabilities               $ 500    
Revenue | Credit Concentration Risk                    
Significant Accounting Policies [Line Items]                    
Number of distributors representing more than 10% of company's revenue | Distributor               3 3 3
Accounts Receivable | Credit Concentration Risk                    
Significant Accounting Policies [Line Items]                    
Concentration risk, customer               At December 31, 2021 and 2020, three customers accounted for 10% or more of accounts receivable    
Number of customers | Customer               3 3  
Revenue Benchmark | Customer Concentration Risk                    
Significant Accounting Policies [Line Items]                    
Number of customers accounted for 10% or more of revenues | Customer               0 0 0
Revenue Benchmark | Customer Concentration Risk | Distributor One                    
Significant Accounting Policies [Line Items]                    
Concentration risk, percentage               22.00% 40.00% 23.00%
Revenue Benchmark | Distributor Concentration Risk                    
Significant Accounting Policies [Line Items]                    
Number of distributors accounted for 10% or more of revenues | Distributor               0 0 0
Level 1                    
Significant Accounting Policies [Line Items]                    
Cash balances in bank               $ 339,300,000 $ 18,400,000  
Highly liquid money market funds               $ 220,200,000 $ 55,100,000  
MegaChips                    
Significant Accounting Policies [Line Items]                    
Agreement termination date   Nov. 03, 2021                
Minimum                    
Significant Accounting Policies [Line Items]                    
Property and equipment, estimated useful life               5 years    
Revenue Recognized Payment Terms               30 days    
Minimum | Capitalized Internal Use Software                    
Significant Accounting Policies [Line Items]                    
Estimated useful life of intangible assets               2 years    
Minimum | Purchased Intangibles with Finite Lives                    
Significant Accounting Policies [Line Items]                    
Estimated useful life of intangible assets               3 years    
Minimum | Revenue | Customer Concentration Risk                    
Significant Accounting Policies [Line Items]                    
Concentration risk, percentage               10.00% 10.00% 10.00%
Minimum | Revenue | Distributor Concentration Risk                    
Significant Accounting Policies [Line Items]                    
Concentration risk, percentage               10.00% 10.00% 10.00%
Minimum | Accounts Receivable | Customer Concentration Risk                    
Significant Accounting Policies [Line Items]                    
Concentration risk, percentage               10.00% 10.00%  
Maximum                    
Significant Accounting Policies [Line Items]                    
Foreign currency remeasurement and transactions gains and losses                   $ 100,000
Property and equipment, estimated useful life               7 years    
Warranty reserve balances               $ 100,000 $ 100,000  
Revenue Recognized Payment Terms               60 days    
Revenue recognized amortization period term               1 year    
Maximum | Capitalized Internal Use Software                    
Significant Accounting Policies [Line Items]                    
Estimated useful life of intangible assets               3 years    
Maximum | Purchased Intangibles with Finite Lives                    
Significant Accounting Policies [Line Items]                    
Estimated useful life of intangible assets               5 years    
Initial Public Offering [Member]                    
Significant Accounting Policies [Line Items]                    
Issuance of common stock upon net of underwriting discounts and commissions and other offerings costs, Shares | shares         4,945,000          
Shares issued price per share | $ / shares         $ 13.00          
Proceeds from public offering, net of underwriting discounts and commissions         $ 56,400,000          
Payments for underwriting discounts, commissions and offering costs         $ 7,900,000          
Follow-on Public Offering (June 2020 Offering)                    
Significant Accounting Policies [Line Items]                    
Deferred offering costs $ 300   $ 300,000 $ 300,000            
Proceeds from public offering, net of underwriting discounts and commissions 279,000,000.0   181,600,000 45,800,000            
Payments for underwriting discounts and commissions $ 13,200,000   $ 8,600,000 $ 2,700,000            
Follow-on Public Offering (June 2020 Offering) | SiTime Corporation                    
Significant Accounting Policies [Line Items]                    
Issuance of common stock upon net of underwriting discounts and commissions and other offerings costs, Shares | shares 1,300,000   1,500,000 1,525,000            
Over-Allotment Option                    
Significant Accounting Policies [Line Items]                    
Issuance of common stock upon net of underwriting discounts and commissions and other offerings costs, Shares | shares         645,000          
Restricted Stock Units RSU                    
Significant Accounting Policies [Line Items]                    
Number of Shares, Granted | shares               438,474 682,517 3,012,399