Back in 2018, former Apple employee Xiaolang Zhang was arrested at San Jose International Airport where he was going to board a last-minute flight to China. Zhang was accused of transferring a 25-page document that includes the engineering schematics of a circuit board for the company's self-driving vehicle, along with technical manuals describing Apple's prototype, to his wife's laptop. He was also accused of stealing circuit boards and a Linux server from the company's development labs. Now, Zhang has pleaded guilty to a felony charge of theft of trade secrets in San Jose federal court, according to CNBC. The news organization has obtained a court document (PDF) summarizing the proceedings in which Zhang changed his plea -- he originally pleaded not guilty when he was indicted in 2018.