Summary of Significant Accounting Policies - Narrative (Details)						1 Months Ended			3 Months Ended
	Apr. 29, 2019 shares	Apr. 18, 2019 shares	Apr. 03, 2019 shares	Jan. 02, 2019	Mar. 02, 2016 USD ($)	Dec. 31, 2016 USD ($)	Feb. 28, 2016 USD ($) shares	Oct. 31, 2015 USD ($)	Mar. 30, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($)	May 06, 2019 shares	Dec. 31, 2018 USD ($)	Jun. 30, 2018 $ / shares shares
Class of Warrant or Right [Line Items]
Stock split, conversion ratio				1.5
Deferred offering costs									$ 3,400,000			$ 3,200,000
Liability for estimated sales discounts									900,000			$ 800,000
Cost of goods sold									$ 29,435,000	$ 10,719,000
Stock options granted (in shares) | shares									0
Common Stock | Line of credit | SVB Credit Facilities
Class of Warrant or Right [Line Items]
Number of warrants issued (in shares) | shares									60,002				60,002
Exercise price (in dollars per share) | $ / shares									$ 3.00				$ 3.00
Series B
Class of Warrant or Right [Line Items]
Number of warrants issued (in shares) | shares									121,694				121,694
Exercise price (in dollars per share) | $ / shares									$ 1.07				$ 1.07
Series E
Class of Warrant or Right [Line Items]
Number of warrants issued (in shares) | shares									39,073				39,073
Exercise price (in dollars per share) | $ / shares									$ 3.68				$ 3.68
IPO | Subsequent event | Common Stock
Class of Warrant or Right [Line Items]
Number of warrants issued (in shares) | shares											160,767
Shipping and handling
Class of Warrant or Right [Line Items]
Cost of goods sold									$ 1,300,000	$ 1,100,000
Distributor one | Customer concentration risk | Revenue benchmark
Class of Warrant or Right [Line Items]
Concentration risk									21.00%	34.00%
Distributor two | Customer concentration risk | Revenue benchmark
Class of Warrant or Right [Line Items]
Concentration risk									21.00%	14.00%
Distributor three | Customer concentration risk | Revenue benchmark
Class of Warrant or Right [Line Items]
Concentration risk										11.00%
International | Geographic concentration risk | Revenue benchmark
Class of Warrant or Right [Line Items]
Concentration risk									14.00%
Donald Thompson
Class of Warrant or Right [Line Items]
Consulting fees, related party									$ 0	$ 47,162
Consulting agreement | Executive Chair
Class of Warrant or Right [Line Items]
Monthly transaction amount					$ 20,210.33
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
2018 Plan | Subsequent event
Class of Warrant or Right [Line Items]
Stock options granted (in shares) | shares	51,999	1,000,000	264,033
Restricted stock unit | 2018 Plan | Executive Chair
Class of Warrant or Right [Line Items]
Fair value per share (in dollars per share)					$ 105,000
Vesting period					12 months
Termination period upon prior written notice					120 days
Breach, termination period upon prior written notice, non-breaching party					30 days
Non-qualified stock option | Amended advisor agreement | Food System Strategies, LLC
Class of Warrant or Right [Line Items]
Vesting period							3 years
Stock options granted (in shares) | shares							798,848
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