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Related Party Transactions - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Stock-based compensation expense	$ 6,374,000	$ 812,000	$ 9,272,000	$ 2,174,000
Selling, General and Administrative Expenses [Member]
Related Party Transaction [Line Items]
Stock-based compensation expense	5,929,000	577,000	8,283,000	1,541,000
Former Director and Shareholder [Member] \| Patent Rights from Former Director and Shareholder [Member]
Related Party Transaction [Line Items]
Royalty expense	22,000	10,000	$ 61,000	32,000
Former Director and Shareholder [Member] \| Patent Rights from Former Director and Shareholder [Member] \| Royalty Expenses [Member]
Related Party Transaction [Line Items]
Royalty expense as a percentage of net sales			3.00%
Beneficial Customer [Member] \| Sales [Member]
Related Party Transaction [Line Items]
Revenue from related parties	8,000	50,000	$ 500,000	200,000
Director and the Chairman [Member] \| Selling, General and Administrative Expenses [Member] \| Performance Stock Units [Member]
Related Party Transaction [Line Items]
Stock-based compensation expense	4,000,000		4,000,000
Director and the Chairman [Member] \| Consulting Agreement [Member] \| Selling, General and Administrative Expenses [Member]
Related Party Transaction [Line Items]
Consulting fees incurred for related party	55,000	81,000	100,000	200,000
Officer [Member] \| Consulting Agreement [Member] \| Selling, General and Administrative Expenses [Member]
Related Party Transaction [Line Items]
Consulting fees incurred for related party		93,000		300,000
Current Director and Officer [Member] \| Consulting Agreement [Member] \| Selling, General and Administrative Expenses [Member]
Related Party Transaction [Line Items]
Consulting fees incurred for related party		200,000		400,000
Orbimed Royalty Oppurtunities Two LP and Deerfield Private Design Fund LP [Member] \| 2019 Credit Agreement [Member]
Related Party Transaction [Line Items]
Line of credit maximum borrowing capacity					$ 70,000,000
Line of credit cumulative drawdowns till date	40,000,000		40,000,000
Interest expenses related party	$ 1,400,000	$ 1,400,000	$ 4,100,000	$ 2,100,000