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

6 Months Ended

Jun. 30, 2020

Stockholders' Equity Note [Abstract]

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 June 30, 2020, and changes during the six 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
Granted	—	—
Exercised	(54,864)	1.23
Forfeited, cancelled or expired	(87,375)	2.63
Outstanding at June 30, 2020	10,216,840	$	4.23	6.2	$	—
Options exercisable at June 30, 2020	9,876,966	$	4.35	6.1	$	—

The following table summarizes activity under our equity incentive plans related to the China Cash Bonuses as of June 30, 2020, and changes during the six 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
Forfeited, cancelled or expired	(183,000)	5.42
Outstanding at June 30, 2020	904,500	$	5.16	5.0	$	—
Options exercisable at June 30, 2020	882,750	$	5.25	4.9	$	—