Common Stock, Common Stock Warrants and Stock Option Plan - 2015 Equity Incentive Plan (Details) - shares	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Oct. 26, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	15,035,095	14,093,625
2015 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)			1,813,272
Stock option grants description	The number of shares reserved for issuance under our 2015 Equity Incentive Plan will increase automatically on the first day of January of each of 2016 through 2025 by the number of shares equal to 4% of the total outstanding shares of our common stock as of the immediately preceding December 31.
Percentage threshold of outstanding shares increased annually under the plan (as a percent)	4.00%
Incentive stock options, maximum shares that may be issued (in shares)	25,000,000
Existing Employee [Member] \| 2015 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares authorized for issuance (in shares)	2,000,000
New Employee [Member] \| 2015 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares authorized for issuance (in shares)	4,000,000
Non Employee Director [Member] \| 2015 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares authorized for issuance (in shares)	300,000

ADESTO TECHNOLOGIES Corp 10-Q