Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

v3.20.4
Summary of Significant Accounting Policies - Additional Information (Details)
12 Months Ended
Jul. 24, 2020
USD ($)
shares
Jul. 22, 2020
shares
Jun. 29, 2020
$ / shares
shares
Jun. 24, 2020
USD ($)
$ / shares
shares
Nov. 25, 2019
USD ($)
Dec. 31, 2020
USD ($)
Customer
$ / shares
shares
Dec. 31, 2019
USD ($)
Customer
$ / shares
May 11, 2020
$ / shares
Oct. 31, 2019
$ / shares
Dec. 31, 2018
USD ($)
Dec. 12, 2017
$ / shares
Schedule Of Significant Accounting Policies [Line Items]                      
Total current assets           $ 85,045,000 $ 86,502,000        
Total current liabilities           88,768,000 $ 125,946,000        
Net liabilities current           3,700,000          
Business combination transaction related costs         $ 13,100,000 2,700,000          
Business combination, deferred consideration         15,000,000.0 7,500,000          
Obligations net under shares purchase forward agreements entered by former entity         13,200,000 $ 483,000          
Business combination, notes payable acquired         3,600,000            
Common stock, par value | $ / shares           $ 0.0001 $ 0.0001       $ 0.0001
Revenue           $ 147,368,000 $ 129,558,000        
Number of performance obligations           1          
Revenue from usage-based fees in total revenue           98.00% 98.00%        
Revenue from term-based fees in total revenue           2.00% 2.00%        
Subscription-based fee contractual period           1 year          
Contract assets           $ 0          
Deferred revenue           3,666,000 $ 1,397,000        
Deferred revenue recognized           1,100,000          
Marketable securities           $ 4,800,000 5,100,000        
Recognized income tax positions           greater than 50 percent          
Restricted cash           $ 0 20,900,000        
Allowance for doubtful accounts           850,000 873,000     $ 157,000  
Goodwill impairment charges           0          
Impairment charges           $ 0 0        
ASU 2020-04 [Member]                      
Schedule Of Significant Accounting Policies [Line Items]                      
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]           true          
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]           true          
ASU 2018-13                      
Schedule Of Significant Accounting Policies [Line Items]                      
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]           true          
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]           true          
Sales and Marketing                      
Schedule Of Significant Accounting Policies [Line Items]                      
Advertising costs           $ 1.0 $ 956,000        
Internal-use Software Development Costs                      
Schedule Of Significant Accounting Policies [Line Items]                      
Property and equipment, useful life           4 years          
Customer Concentration Risk | Revenue                      
Schedule Of Significant Accounting Policies [Line Items]                      
Concentration risk percentage           10.00% 10.00%        
Number of customers | Customer           0 1        
Customer Concentration Risk | Trade Receivables                      
Schedule Of Significant Accounting Policies [Line Items]                      
Concentration risk percentage           10.00% 10.00%        
Number of customers | Customer           1 0        
Customer 1 | Customer Concentration Risk                      
Schedule Of Significant Accounting Policies [Line Items]                      
Revenue             $ 13,400,000        
Customer 1 | Customer Concentration Risk | Trade Receivables                      
Schedule Of Significant Accounting Policies [Line Items]                      
Revenue           $ 4,500,000          
Kaleyra Incorporation                      
Schedule Of Significant Accounting Policies [Line Items]                      
Business combination transaction related costs             $ 7,700,000        
Business combination, notes payable acquired         $ 34,580,000            
Open Market | Kaleyra Incorporation | Yakira Capital Management Inc                      
Schedule Of Significant Accounting Policies [Line Items]                      
Business combination, shares acquired | shares           219          
Business combination, share price | $ / shares           $ 11.00          
Common Stock                      
Schedule Of Significant Accounting Policies [Line Items]                      
Issuance and sale of common stock | shares           8,762,694          
Underwriting Agreement                      
Schedule Of Significant Accounting Policies [Line Items]                      
Common stock, par value | $ / shares     $ 0.0001 $ 0.0001              
Public offering price before underwriting discounts and commissions | $ / shares       $ 4.50              
Underwriter agreement, option to exercisable period       30 days              
Purchase up to additional common stock | shares       1,166,666              
Underwriting Agreement | Common Stock                      
Schedule Of Significant Accounting Policies [Line Items]                      
Issuance and sale of common stock | shares     7,777,778 7,777,778              
Net proceeds after deducting underwriting discounts and commissions and estimated offering expenses       $ 32,000,000.0              
Underwriting Agreement | Common Stock | Over Allotment Option                      
Schedule Of Significant Accounting Policies [Line Items]                      
Issuance and sale of common stock | shares 984,916 984,916                  
Net proceeds after deducting underwriting discounts and commissions and estimated offering expenses $ 4,200,000                    
Forward Share Purchase Agreement | Yakira                      
Schedule Of Significant Accounting Policies [Line Items]                      
Business combination, share price | $ / shares                 $ 10.50    
Forward Share Purchase Agreement | Yakira Capital Management Inc                      
Schedule Of Significant Accounting Policies [Line Items]                      
Business combination, share price | $ / shares               $ 10.6819      
Forward Share Purchase Agreement | Kaleyra Incorporation | Yakira                      
Schedule Of Significant Accounting Policies [Line Items]                      
Prepayment amount transferred           $ 17,000,000.0