STOCK-BASED COMPENSATION - Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
2016 Employee Stock Purchase Plan
Stock-based compensation shares available	200,000		200,000
Discount from market price (as a percent)			15.00%
Allocated share-based compensation expense	$ 73	$ 33	$ 111	$ 65
2022 Plan
Stock-based compensation shares available	1,100,000		1,100,000
Stock-based compensation additional shares authorized			1,150,000
Allocated share-based compensation expense	$ 3,683	2,811	$ 6,882	4,648
Cost of sales \| 2016 Employee Stock Purchase Plan
Allocated share-based compensation expense	19	4	29	8
Cost of sales \| 2022 Plan
Allocated share-based compensation expense	124	2	259	2
Research and development \| 2016 Employee Stock Purchase Plan
Allocated share-based compensation expense	15	6	22	11
Research and development \| 2022 Plan
Allocated share-based compensation expense	180	149	345	263
Selling, general and administrative \| 2016 Employee Stock Purchase Plan
Allocated share-based compensation expense	39	23	60	46
Selling, general and administrative \| 2022 Plan
Allocated share-based compensation expense	$ 3,379	$ 2,660	$ 6,278	$ 4,383

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Discount rate from fair value on purchase date that participants pay for shares.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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