STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of stock-based compensation expense recognized for stock options, stock awards, restricted stock units and the Company's employee stock purchase program (ESPP)

The following table presents stock‑based compensation expense recognized in the Company’s Consolidated Statements of Comprehensive Income (in thousands):

	Three Months Ended March 31,
	2020		2019
Cost of sales	$	23	$	—
Research and development expense	163		273
Selling, general and administrative expense	1,748		2,429
Restructuring	—		—
Total	$	1,934	$	2,702