Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Segment	Sep. 30, 2019 USD ($)	May 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Summary of Significant Accounting Policies [Line Items]
Restricted cash as collateral for facility lease	$ 338,000		$ 338,000			$ 338,000
Restricted cash to secure corporate purchasing cards	50,000		50,000			50,000
Allowance for doubtful accounts	77,000		77,000			62,000
Accounts receivable write offs	$ 0	$ 0	$ 0	$ 0
Deferred initial public offering costs					$ 3,701,000
Number of operating segments | Segment			1
Accounting Standards Update 2018-07
Summary of Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2020		Jan. 01, 2020
Change in accounting principle, accounting standards update, immaterial effect	true		true
Selling, General and Administrative Expenses
Summary of Significant Accounting Policies [Line Items]
Advertising costs	$ 106,000	$ 30,000	$ 217,000	$ 65,000
Other Noncurrent Assets
Summary of Significant Accounting Policies [Line Items]
Deferred initial public offering costs						1,382,000
Accounts Receivable, Net
Summary of Significant Accounting Policies [Line Items]
Unbilled receivables	441,000		$ 441,000			330,000
Leasehold Improvements
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives			shorter of the useful life of the improvement or the lease term
Cash Secured Letter of Credit
Summary of Significant Accounting Policies [Line Items]
Restricted cash as collateral for facility lease	338,000		$ 338,000			$ 338,000
Maximum
Summary of Significant Accounting Policies [Line Items]
Deposits, FDIC insured amount	$ 250,000		$ 250,000
Estimated useful lives of assets			7 years
Minimum
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives of assets			3 years