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Loan and Security Agreement - Additional Information (Detail) - Loan and Security Agreement [Member] - Pacific Western Bank [Member]
9 Months Ended
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Warrant to be issued to purchase number of shares capital stock equal to the amount of each term loan borrowing percentage 1.00%
Term Loan [Member]  
Debt Instrument [Line Items]  
Maximum term loan borrowings $ 15,000,000
Interest rate during period 3.75%
Term loan payment terms The Company has a loan and security agreement (the “Loan Agreement”) with Pacific Western Bank (“PWB”), entered into in 2017, which provided for term loan borrowings of up to $15.0 million through January 19, 2019. Borrowings under the Loan Agreement bear interest at a variable annual rate equal to the greater of (i) the prime rate plus 0.25% or (ii) 3.75%, and were payable over an interest-only period until January 19, 2019, followed by a 24-month period of equal monthly payments of principal and interest. All amounts outstanding as of the maturity date of January 19, 2021 become immediately due and payable. In January 2019, the Company amended the Loan Agreement to extend the available date for borrowings from January 19, 2019 to June 30, 2019 and extend the interest only period from January 19, 2019 to June 30, 2020, with the possibility of further extension to March 31, 2021 if certain equity financing considerations are met. Additionally, the loan repayment period will be over a 24-month period following the end of the interest-only period. In June 2019, the Company further amended the Loan Agreement to extend the available date for borrowings from June 30, 2019 to June 30, 2020. On July 31, 2019, the Company amended the Loan Agreement to provide for changes to the primary depository requirements with PWB.
Outstanding amount maturity date Jan. 19, 2021
Term of loan 24 months
Term loan frequency of periodic payment monthly
Term loans borrowed $ 0
Term Loan [Member] | Prime Rate [Member]  
Debt Instrument [Line Items]  
Annual variable interest rate 0.25%