Sonim Technologies Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Additional Information (Details)

Stock-based Compensation - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	May 15, 2020	May 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares exercised					366,732
Unamortized stock-based compensation cost related to unvested stock options			$ 3,547		$ 3,547
Unamortized stock-based compensation cost, weighted average period of recognition					3 years
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, Unvested			2,577,375		2,577,375
Stock issued during period			676,500	0	2,692,000	0
2019 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available to be issued			2,967,576		2,967,576
Increase in common stock reserved for future issuance		3,000,000
Increase In common stock reserved for issuance of number of shares of capital stock outstanding			1,021,861		1,021,861
2019 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available to be issued			408,453		408,453
Common stock, number of shares available for sale			541,379		541,379
Period in which reserved shares will increase annually					10 years
Increase in common stock reserved for issuance as a percentage of total number of shares of capital stock outstanding on the last day of the prior calendar year			1.00%		1.00%
Increase In common stock reserved for issuance of number of shares of capital stock outstanding on last day of prior calendar year			500,000		500,000
Increase In common stock reserved for issuance of number of shares of capital stock outstanding			204,372		204,372
Common stock reserved for issuance description					Additionally, the number of shares of common stock reserved for issuance under the 2019 Employee Stock Purchase Plan automatically increases on January 1 of each calendar year for 10 years, starting January 1, 2020, and ending on, and including, January 1, 2029, in an amount equal to the lesser of 1% of the total number of shares of capital stock outstanding on December 31st of the prior calendar year, and (ii) 500,000 shares, unless the Board of Directors or the compensation committee of the Board of Directors determines prior to such date that there will be a lesser increase, or no increase.
Number of shares issued	64,320
2012 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period					10 years
Number of shares exercised					0		0
2012 Equity Incentive Plan \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period					2 years
2012 Equity Incentive Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period					4 years
2012 Equity Incentive Plan \| Options and SARs \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price options granted from fair value common stock, percent					100.00%
2012 Equity Incentive Plan \| Granted to Ten Percent Stockholders \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price options granted from fair value common stock, percent					110.00%
2012 Equity Incentive Plan \| Granted to Ten Percent Stockholders \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period					5 years
2019 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, number of shares available for sale			5,906,900		5,906,900
Period in which reserved shares will increase annually					10 years
Increase in common stock reserved for issuance as a percentage of total number of shares of capital stock outstanding on the last day of the prior calendar year			5.00%		5.00%
Common stock reserved for issuance description					5,906,900 shares of common stock are reserved for future issuance under the 2019 Option Plan, plus the number of shares subject to outstanding stock options or other stock awards that were granted under the 2012 Option Plan that are forfeited, terminated, expire or are otherwise not issued. Additionally, the number of shares of common stock reserved for issuance under the 2019 Option Plan automatically increases on January 1 of each calendar year for 10 years, starting January 1, 2020 and ending on and including January 1, 2029, in an amount equal to 5% of the total number of shares of capital stock outstanding on December 31 of the prior calendar year, unless the Board of Directors or compensation committee determines prior to the date of increase that there will be a lesser increase, or no increase.