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				3 Months Ended		9 Months Ended		12 Months Ended
	May 13, 2019	Apr. 10, 2019	Sep. 10, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares exercised						85,559
Compensation expense				$ 307	$ 63	$ 5,911	$ 129
Accelerated vesting of options						1,139,418
Unamortized stock-based compensation cost related to unvested stock options				$ 2,473		$ 2,473
Unamortized stock-based compensation cost, weighted average period of recognition						3 years
IPO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense						$ 287
Chief Financial Officer \| IPO
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Accelerated vesting of options			201,666
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares exercised				13,525		85,559	9,977
Common Stock \| Chief Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock award, fully vested shares	383,197
Restricted stock award, net shares issued	210,758
Restricted stock award, shares withheld to satisfy tax obligations	172,439
Tax obligations recorded as reduction in additional paid in capital	$ 1,897
Restricted Stock Unit
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate restricted stock units, granted		128,000
Aggregate restricted stock units, outstanding				90,000		90,000
Restricted Stock Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense						$ 4,215
2012 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available to be issued				0		0
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 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available to be issued				2,011,449		2,011,449
2019 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, number of shares available for sale				337,007		337,007
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
Common stock reserved for issuance description						Additionally, the number of shares of common stock reserved for issuance under the 2019 Employee Stock Purchase Plan will automatically increase 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 compensation committee determines prior to such date that there will be a lesser increase, or no increase.
Number of shares issued						0
2019 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, number of shares available for sale				1,885,039		1,885,039
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						1,885,039 shares of common stock are reserved for future issuance under the 2019 Equity Incentive 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 Equity Incentive Plan will automatically increase 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.