Debt - Additional Information (Detail) $ in Millions	1 Months Ended	9 Months Ended
	Dec. 31, 2018 USD ($) Installment	Sep. 30, 2020 USD ($)
SVB Term Loan
Debt Instrument [Line Items]
Total principal amount	$ 56.0	$ 56.0
Debt maturity date	Dec. 01, 2023
Debt instrument interest rate percentage	6.30%	6.30%
Frequency of periodic payment		monthly
Number of installments | Installment	36
Number of installments if achieving trailing revenue target and company so elects | Installment	30
Debt instrument description		Beginning on December 1, 2020 (or June 1, 2021, if the Company achieves a trailing twelve-month revenue of at least a specified amount and elects to apply such later date), the Company will make thirty-six equal monthly payments of principal (or thirty equal payments, if the Company so elects).
Final payment percentage of original principal amount	3.15%	3.15%
Proceeds from term loan		$ 55.4
Legal and consulting fees		$ 0.6
Debt instrument amendment terms		The First Amendment, among other things, amended the SVB Term Loan to (i) suspend testing of the minimum revenue financial covenant for the fiscal quarter ended December 31, 2019, (ii) provide for the minimum trailing twelve-month revenue thresholds under the minimum revenue financial covenant for periods ending on the last day of fiscal quarters in fiscal years subsequent to 2020 to be determined annually at the greater of (a) a 25% cushion to revenue forecasts provided by the Company to SVB and (b) 10% year-over-year annual growth, unless otherwise agreed, (iii) increase the minimum liquidity ratio financial covenant from 1.50:1.00 to 1.75:1.00 and (iv) increase the prepayment premium from 1.00% to 2.00% for amounts prepaid under the SVB Term Loan prior to the maturity date thereof, subject to certain exceptions.
CRG Term Loan
Debt Instrument [Line Items]
Debt extinguishment loss		$ 2.4
Write-offs of unamortized debt discount and debt issuance costs		$ 0.3