Related-Party Transactions	12 Months Ended
Jan. 31, 2019
Related Party Transactions [Abstract]
Related-Party Transactions	16. Related-Party Transactions The Company considers an entity to be a related party if it owns more than 10% of the Company’s total voting stock at the end of each reporting period or if an officer or employee of an entity also serves on the Company’s board of directors or if it is a significant shareholder and has material business transactions with the Company. The Company enters into software license agreements with Cadence Design Systems, Inc. (“Cadence”) from time to time. The Chief Executive Officer of Cadence, who is also the President and a Director of Cadence, was a member of the Company’s Board of Directors until June 7, 2017. As of January 31, 2019, the unpaid liabilities associated with these agreements were approximately $3.9 million. The Company paid $3.6 million, $3.6 million and $2.8 million of license fee for the fiscal years ended January 31, 2019, 2018 and 2017, respectively. License amortization expense related to these agreements included in research and development expense was approximately $3.4 million, $3.2 million and $2.9 million for the fiscal years ended January 31, 2019, 2018 and 2017, respectively.

Related-Party Transactions

12 Months Ended

Jan. 31, 2019

16. Related-Party Transactions

The Company considers an entity to be a related party if it owns more than 10% of the Company’s total voting stock at the end of each reporting period or if an officer or employee of an entity also serves on the Company’s board of directors or if it is a significant shareholder and has material business transactions with the Company.

The Company enters into software license agreements with Cadence Design Systems, Inc. (“Cadence”) from time to time. The Chief Executive Officer of Cadence, who is also the President and a Director of Cadence, was a member of the Company’s Board of Directors until June 7, 2017. As of January 31, 2019, the unpaid liabilities associated with these agreements were approximately $3.9 million. The Company paid $3.6 million, $3.6 million and $2.8 million of license fee for the fiscal years ended January 31, 2019, 2018 and 2017, respectively. License amortization expense related to these agreements included in research and development expense was approximately $3.4 million, $3.2 million and $2.9 million for the fiscal years ended January 31, 2019, 2018 and 2017, respectively.