Organization and Description of Business - Additional Information (Details) - USD ($)		1 Months Ended	2 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 26, 2020	Aug. 31, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Organization And Description Of Business [Line Items]
Operating losses				$ 106,000	$ (14,071,000)	$ (15,610,000)	$ (36,799,000)	$ (54,300,000)
Accumulated deficit				(148,581,000)		(148,581,000)		(129,809,000)
Cash on hand				37,385,000		37,385,000		30,353,000
Outstanding borrowings from lenders				28,700,000		28,700,000		35,100,000
Available capacity on borrowings				$ 0		0		$ 0
Equity financing		$ 23,400,000				$ 125,400,000
Percentage of growth in net revenue				45.00%
Sales Revenue | Sale of Products Online in U.S
Organization And Description Of Business [Line Items]
Percentage of revenue				90.00%
Key Manufacturing Partner | China
Organization And Description Of Business [Line Items]
Percentage of manufacturing capacity reached			90.00%
Expected percentage of manufacturing over company's inventory						30.00%
Truweo Assets
Organization And Description Of Business [Line Items]
Date of completion of Acquisition	Aug. 26, 2020
Total consideration	$ 16,400,000
Total consideration paid by cash	14,000,000
Consideration paid in form of unsecured promissory note	2,400,000
Truweo Assets | Promissory Note
Organization And Description Of Business [Line Items]
Consideration paid in form of unsecured promissory note	$ 2,400,000
Accrued interest rate per annum	8.00%
Principal amount and accrued interest payments	$ 600,000
First principal amount and accrued interest payments due date	Nov. 30, 2021
Second principal amount and accrued interest payments due date	Feb. 28, 2022
Third principal amount and accrued interest payments due date	May 31, 2022
Maturity date	Aug. 22, 2022
Follow-on Public Offering
Organization And Description Of Business [Line Items]
Issuance of common stock, including underwriter's over-allotment, net of offering costs and underwriter's discount, shares	3,860,710
Shares issued, price per share	$ 7.00
Net proceeds from sale of common stock	$ 23,400,000
Underwriting discounts and commissions	2,200,000
Other offering expenses	$ 1,400,000