Summary of Significant Accounting Policies - Narrative (Details)			1 Months Ended				3 Months Ended								12 Months Ended
	Apr. 08, 2019 USD ($)	Jan. 02, 2019	Dec. 31, 2016 USD ($)	Feb. 28, 2016 USD ($) shares	Dec. 31, 2015 USD ($)	Oct. 31, 2015 USD ($)	Dec. 31, 2019 USD ($) $ / shares shares	Sep. 28, 2019 USD ($)	Jun. 29, 2019 USD ($)	Mar. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 29, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Jan. 01, 2020 USD ($)	May 06, 2019 USD ($) shares	May 05, 2019 $ / shares shares
Class of Warrant or Right [Line Items]
Number of operating segments | segment															1
Number of reportable segments | segment															1
Stock split, conversion ratio		1.5
Allowance for doubtful accounts							$ 0				$ 0				$ 0	$ 0
Deferred offering costs, incurred and paid															0	2,415,000	$ 0
Accrued stock issuance costs															$ 0
Warrants outstanding (in shares) | shares							0								0
Liability for estimated sales discounts							$ 1,600,000				800,000				$ 1,600,000	800,000
Advertising costs															300,000	62,000	300,000
Cost of goods sold							65,018,000	$ 59,178,000	$ 44,510,000	$ 29,435,000	23,651,000	$ 21,235,000	$ 14,755,000	$ 10,719,000	198,141,000	70,360,000	34,772,000
Research and development expenses							$ 5,989,000	$ 5,951,000	$ 4,212,000	$ 4,498,000	$ 3,320,000	$ 2,165,000	$ 2,497,000	$ 1,605,000	20,650,000	9,587,000	5,722,000
Matching contribution															$ 200,000	$ 0	$ 0
Stock options granted (in shares) | shares															1,571,925	2,136,012	382,476
Promissory note receivable					$ 951,245
Fixed interest rate					1.68%
Series B
Class of Warrant or Right [Line Items]
Number of warrants issued (in shares) | shares							121,694								121,694					121,694
Exercise price (in dollars per share) | $ / shares							$ 1.07								$ 1.07					$ 1.07
Series E
Class of Warrant or Right [Line Items]
Number of warrants issued (in shares) | shares							39,073								39,073					39,073
Exercise price (in dollars per share) | $ / shares							$ 3.68								$ 3.68					$ 3.68
IPO
Class of Warrant or Right [Line Items]
Deferred offering costs							$ 4,900,000								$ 4,900,000				$ 4,900,000
Deferred offering costs, incurred and paid															2,500,000	$ 2,400,000
IPO | Common Stock
Class of Warrant or Right [Line Items]
Number of warrants issued (in shares) | shares																			160,767
Secondary Offering
Class of Warrant or Right [Line Items]
Deferred offering costs							$ 1,100,000								1,100,000
Deferred offering costs, incurred and paid															2,200,000
Shipping and Handling
Class of Warrant or Right [Line Items]
Cost of goods sold															$ 10,900,000	$ 6,100,000	$ 3,400,000
Distributor One | Customer Concentration Risk | Revenue Benchmark
Class of Warrant or Right [Line Items]
Concentration risk															17.00%	32.00%	38.00%
Distributor Two | Customer Concentration Risk | Revenue Benchmark
Class of Warrant or Right [Line Items]
Concentration risk															16.00%	21.00%	10.00%
Distributor Three | Customer Concentration Risk | Revenue Benchmark
Class of Warrant or Right [Line Items]
Concentration risk																13.00%	10.00%
International | Geographic Concentration Risk | Revenue Benchmark
Class of Warrant or Right [Line Items]
Concentration risk															16.00%	7.00%	1.00%
Donald Thompson
Class of Warrant or Right [Line Items]
Consulting fees, related party															$ 0	$ 121,546	$ 0
Consulting Agreement | Executive Chair
Class of Warrant or Right [Line Items]
Monthly transaction amount	$ 20,210.33
Consulting fees, related party															265,548	189,583	160,417
Bonus | Executive Chair
Class of Warrant or Right [Line Items]
Consulting fees, related party															121,260
Advisor Agreement | Food System Strategies, LLC
Class of Warrant or Right [Line Items]
Daily transaction amount						$ 4,000
Amended Advisor Agreement | Food System Strategies, LLC
Class of Warrant or Right [Line Items]
Monthly transaction amount			$ 10,000	$ 25,000
Consulting fees, related party															$ 120,000	140,000	125,000
Non-qualified Stock Option | Amended Advisor Agreement | Food System Strategies, LLC
Class of Warrant or Right [Line Items]
Stock options granted (in shares) | shares				532,590
Vesting period				3 years
Minimum | Advisor Agreement | Food System Strategies, LLC
Class of Warrant or Right [Line Items]
Days of service						2 days
Minimum | Amended Advisor Agreement | Food System Strategies, LLC
Class of Warrant or Right [Line Items]
Days of service			5 days
Maximum | Amended Advisor Agreement | Food System Strategies, LLC
Class of Warrant or Right [Line Items]
Days of service			6 days
SVB Credit Facilities | Common Stock | Line of Credit
Class of Warrant or Right [Line Items]
Number of warrants issued (in shares) | shares							60,002								60,002					60,002
Exercise price (in dollars per share) | $ / shares							$ 3.00								$ 3.00					$ 3.00
Contract Termination | Shipping and Handling
Class of Warrant or Right [Line Items]
Cost of goods sold															$ 0	$ 0	$ 800,000
ASU 2016-02 | Adjustment | Forecast | Minimum
Class of Warrant or Right [Line Items]
Operating lease liabilities																		$ 11,000,000
Operating right-of-use assets																		11,000,000
ASU 2016-02 | Adjustment | Forecast | Maximum
Class of Warrant or Right [Line Items]
Operating lease liabilities																		13,000,000
Operating right-of-use assets																		$ 13,000,000