Commitments and Contingencies	3 Months Ended
Mar. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	5. Commitments and contingencies Operating leases In January 2021 the Company entered a new operating lease for laboratory and office space in Chicago, IL. As of March 31, 2021, the Company did not have access to the space, concluded that the leasehold improvements were lessor owned and determined that the lease had not yet commenced for accounting purposes. The lease will continue for an initial term of 11 years, with options to extend the term for two successive five-year periods after the initial expiration date. The Company’s minimum commitment under the new lease is approximately $1.7 million annually with fixed escalations of 2.5% per annum. In January 2021, the Company entered a new operating lease for laboratory and office space in Redwood City, CA. As of March 31, 2021, the Company did not have access to the space, concluded that the leasehold improvements were lessor owned and determined that the lease had not yet commenced for accounting purposes. The lease will continue for an initial term of 10.5 years, with options to extend the term for two successive five-year periods after the initial expiration date. The Company’s minimum commitment under the new lease is approximately $2.6 million annually with fixed escalations of 3.0% per annum. The Company has included $1.0 million of security deposit to secure the lease within other long term assets on the condensed balance sheet. Standby letter of credit Between June 2020 and August 2020, the Company executed and amended a $33.0 million standby letter of credit (LOC) with JPMorgan Chase (JPMC) as terms of collateral that were required by one of the Company’s contract manufacturing organizations. The Company is required to maintain a cash balance of $34.7 million as collateral for the LOC for the term of the contract, which is for a period less than one year from the balance sheet date. The collateral for the LOC is classified as restricted cash on the condensed balance sheets. In conjunction with the Chicago laboratory lease entered into in January 2021, the Company is required to hold an additional LOC in the amount of $0.8 million to secure this lease through its expiration. The Company is required to maintain a cash balance of $0.8 million as collateral for the LOC, which is classified in other long term assets on the condensed balance sheet because it is unavailable for a period longer than one year from the balance sheet date. Neither LOC had been drawn upon as of March 31, 2021. Indemnification agreements In the ordinary course of business, the Company may provide indemnification of varying scope and terms to vendors, lessors, customers and other parties with respect to certain matters including, but not limited to, losses arising out of breach of such agreements or from intellectual property infringement claims made by third parties. The Company also provides indemnifications to directors and officers of the Company to the maximum extent permitted under applicable Delaware law. The maximum potential amount of future payments that the Company could be required to make under these indemnification agreements is, in many cases, unlimited. The Company has not incurred any material costs as a result of such indemnifications and is not currently aware of any indemnification claims. Unconditional purchase obligations In the normal course of business, the Company enters into various firm purchase commitments. As of March 31, 2021, these commitments total approximately $85.5 million in aggregate and are primarily related to the build out of manufacturing capacity of $21.5 million and purchase of certain inventory related items of $64.0 million, all of which are expected to be incurred in 2021.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

Commitments And Contingencies Disclosure [Abstract]

5. Commitments and contingencies

Operating leases

In January 2021 the Company entered a new operating lease for laboratory and office space in Chicago, IL. As of March 31, 2021, the Company did not have access to the space, concluded that the leasehold improvements were lessor owned and determined that the lease had not yet commenced for accounting purposes. The lease will continue for an initial term of 11 years, with options to extend the term for two successive five-year periods after the initial expiration date. The Company’s minimum commitment under the new lease is approximately $1.7 million annually with fixed escalations of 2.5% per annum.

In January 2021, the Company entered a new operating lease for laboratory and office space in Redwood City, CA. As of March 31, 2021, the Company did not have access to the space, concluded that the leasehold improvements were lessor owned and determined that the lease had not yet commenced for accounting purposes. The lease will continue for an initial term of 10.5 years, with options to extend the term for two successive five-year periods after the initial expiration date. The Company’s minimum commitment under the new lease is approximately $2.6 million annually with fixed escalations of 3.0% per annum. The Company has included $1.0 million of security deposit to secure the lease within other long term assets on the condensed balance sheet.

Standby letter of credit

Between June 2020 and August 2020, the Company executed and amended a $33.0 million standby letter of credit (LOC) with JPMorgan Chase (JPMC) as terms of collateral that were required by one of the Company’s contract manufacturing organizations. The Company is required to maintain a cash balance of $34.7 million as collateral for the LOC for the term of the contract, which is for a period less than one year from the balance sheet date. The collateral for the LOC is classified as restricted cash on the condensed balance sheets.

In conjunction with the Chicago laboratory lease entered into in January 2021, the Company is required to hold an additional LOC in the amount of $0.8 million to secure this lease through its expiration. The Company is required to maintain a cash balance of $0.8 million as collateral for the LOC, which is classified in other long term assets on the condensed balance sheet because it is unavailable for a period longer than one year from the balance sheet date.

Neither LOC had been drawn upon as of March 31, 2021.

Indemnification agreements

In the ordinary course of business, the Company may provide indemnification of varying scope and terms to vendors, lessors, customers and other parties with respect to certain matters including, but not limited to, losses arising out of breach of such agreements or from intellectual property infringement claims made by third parties. The Company also provides indemnifications to directors and officers of the Company to the maximum extent permitted under applicable Delaware law. The maximum potential amount of future payments that the Company could be required to make under these indemnification agreements is, in many cases, unlimited. The Company has not incurred any material costs as a result of such indemnifications and is not currently aware of any indemnification claims.

Unconditional purchase obligations

In the normal course of business, the Company enters into various firm purchase commitments. As of March 31, 2021, these commitments total approximately $85.5 million in aggregate and are primarily related to the build out of manufacturing capacity of $21.5 million and purchase of certain inventory related items of $64.0 million, all of which are expected to be incurred in 2021.