Subsequent Event	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On October 5, 2021, the Company announced its intent to acquire privately held Sense Photonics, Inc. ("Sense"), a lidar technology company for autonomous vehicles. On October 22, 2021, the Company completed its acquisition of Sense and formally established Ouster Automotive, a new functional division of the Company focusing on driving mass-market adoption of digital lidar in consumer and commercial vehicles. Under the terms of the merger agreement, Ouster acquired 100% of Sense and all of its property for approximately 10 million shares of Ouster common stock or approximately $63 million in equity value based on the closing price of $6.55 per share as of the day the transaction closed on October 22, 2021, inclusive of 0.8 million shares underlying assumed options, after closing adjustments. The initial purchase price accounting for the business combination is in progress at this time due to the pending completion of the valuation analysis over the acquired assets.