Commitments and Contingencies	3 Months Ended
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies On June 24, 2014, the Company entered into a lease agreement for completed office and laboratory space located in San Diego, California. The office space under the lease is the Company's corporate headquarters. The lease commenced in two phases (in July 2014 and March 2015) at a combined total initial monthly rent of $24,100 per month. The leased property is subject to a 3% annual rent increase following availability. In addition to such base monthly rent, the Company is obligated to pay certain customary amounts for its share of operating expenses and facility amenities. The original lease provided for expiration on January 31, 2018. On March 23, 2017, the Company entered into a First Amendment to Lease Agreement to amend the original lease agreement and to extend the term of the original lease for one year through January 31, 2019. On April 5, 2018, the Company entered into a Second Amendment to Lease Agreement to extend the lease term through January 31, 2020. Subsequently, on August 2, 2018, the Company entered into a Third Amendment to Lease Agreement to expand the size of the existing space for an additional base rent of $4,000 per month. All other terms and covenants from the original lease agreement remain unchanged. The Company's building lease is considered to be an operating lease. The lease agreement indicates the interest rate applicable to the lease is 12%, therefore the Company used a discount rate of 12% to calculate the value of its lease obligations. As of March 31, 2019, the condensed consolidated balance sheet includes a $0.3 million operating lease right-of-use asset within other current assets, and a $0.3 million operating lease liability in deferred revenue and other current liabilities. For the three months ended March 31, 2019, the Company recorded $0.1 million in operating lease cost and the building lease has a remaining lease term of approximately one year from March 31, 2019. As of March 31, 2019, remaining lease payments on an undiscounted basis are $0.3 million for 2019 and an immaterial amount for 2020.

Commitments and Contingencies

On June 24, 2014, the Company entered into a lease agreement for completed office and laboratory space located in San Diego, California. The office space under the lease is the Company's corporate headquarters. The lease commenced in two phases (in July 2014 and March 2015) at a combined total initial monthly rent of $24,100 per month. The leased property is subject to a 3% annual rent increase following availability. In addition to such base monthly rent, the Company is obligated to pay certain customary amounts for its share of operating expenses and facility amenities. The original lease provided for expiration on January 31, 2018. On March 23, 2017, the Company entered into a First Amendment to Lease Agreement to amend the original lease agreement and to extend the term of the original lease for one year through January 31, 2019. On April 5, 2018, the Company entered into a Second Amendment to Lease Agreement to extend the lease term through January 31, 2020. Subsequently, on August 2, 2018, the Company entered into a Third Amendment to Lease Agreement to expand the size of the existing space for an additional base rent of $4,000 per month. All other terms and covenants from the original lease agreement remain unchanged.

The Company's building lease is considered to be an operating lease. The lease agreement indicates the interest rate applicable to the lease is 12%, therefore the Company used a discount rate of 12% to calculate the value of its lease obligations. As of March 31, 2019, the condensed consolidated balance sheet includes a $0.3 million operating lease right-of-use asset within other current assets, and a $0.3 million operating lease liability in deferred revenue and other current liabilities. For the three months ended March 31, 2019, the Company recorded $0.1 million in operating lease cost and the building lease has a remaining lease term of approximately one year from March 31, 2019. As of March 31, 2019, remaining lease payments on an undiscounted basis are $0.3 million for 2019 and an immaterial amount for 2020.