Commitments	3 Months Ended
Mar. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments	3. Commitments Facility Lease In December 2016, the Company entered into an operating lease for office space in Solana Beach, California. The lease commenced on January 1, 2017, was extended in September 2018, and has an expiration date of December 31, 2019. According to ASU No. 2016-02, the Company recognized an operating lease ROU asset and liability based on the present value of the future minimum lease payments over the lease term at the commencement date, using the Company’s assumed incremental borrowing rate, and then amortizes the ROU assets and liabilities over the lease term. The Company applies a discount rate to the minimum lease payments within the lease agreement to determine the value of right-of-use assets and lease liabilities. Unless the rate implicit in the lease is determinable, ASU No. 2016-02 requires the use of the rate of interest that a lessee would have to pay to borrow on a collateralized basis over a similar term for a similar amount to the lease payments in a similar economic environment. The Company noted that the implicit rate in the lease was not determinable and calculated its incremental borrowing rate primarily based on the Company’s assumed borrowing rate of 12%. On January 1, 2019, the Company recorded an operating lease ROU asset and liability of approximately $136,000 based on the present value of the remaining minimum lease payments. During the three months ended March 31, 2019, operating lease ROU asset and liability were included in prepaid expenses and other assets and accounts payable and other current liabilities, respectively, on the statement of cash flows. Rent expense for the three months ended March 31, 2019 and 2018 was approximately $38,000 and $35,000, respectively. The Company also pays pass through costs and utility costs, which are expensed as incurred.

Commitments

3 Months Ended

Mar. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

3. Commitments

Facility Lease

In December 2016, the Company entered into an operating lease for office space in Solana Beach, California. The lease commenced on January 1, 2017, was extended in September 2018, and has an expiration date of December 31, 2019. According to ASU No. 2016-02, the Company recognized an operating lease ROU asset and liability based on the present value of the future minimum lease payments over the lease term at the commencement date, using the Company’s assumed incremental borrowing rate, and then amortizes the ROU assets and liabilities over the lease term. The Company applies a discount rate to the minimum lease payments within the lease agreement to determine the value of right-of-use assets and lease liabilities. Unless the rate implicit in the lease is determinable, ASU No. 2016-02 requires the use of the rate of interest that a lessee would have to pay to borrow on a collateralized basis over a similar term for a similar amount to the lease payments in a similar economic environment. The Company noted that the implicit rate in the lease was not determinable and calculated its incremental borrowing rate primarily based on the Company’s assumed borrowing rate of 12%. On January 1, 2019, the Company recorded an operating lease ROU asset and liability of approximately $136,000 based on the present value of the remaining minimum lease payments. During the three months ended March 31, 2019, operating lease ROU asset and liability were included in prepaid expenses and other assets and accounts payable and other current liabilities, respectively, on the statement of cash flows.

Rent expense for the three months ended March 31, 2019 and 2018 was approximately $38,000 and $35,000, respectively. The Company also pays pass through costs and utility costs, which are expensed as incurred.