STOCKHOLDERS' EQUITY, STOCK-BASED COMPENSATION AND NET LOSS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2020

Stockholders' Equity Note [Abstract]

Schedule of stock option activity under equity incentive plans

The following table summarizes activity under our equity incentive plans related to equity-classified stock option grants as of September 30, 2020, and changes during the nine months then ended:

	Shares	Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2020	10,359,079	$	4.20
Exercised	(148,364)	0.87
Forfeited, cancelled or expired	(87,500)	2.63
Outstanding at September 30, 2020	10,123,215	$	4.26	5.9	$	—
Options exercisable at September 30, 2020	9,959,528	$	4.32	5.9	$	—

The following table summarizes activity under our equity incentive plans related to the China Cash Bonuses as of September 30, 2020, and changes during the nine months then ended:

	Shares	Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2020	1,087,500	$	5.20
Granted	300,000	1.37
Forfeited, cancelled or expired	(313,500)	5.44
Outstanding at September 30, 2020	1,074,000	$	4.07	6.6	$	—
Options exercisable at September 30, 2020	752,250	$	5.21	5.2	$	—