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

3 Months Ended

Mar. 31, 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 March 31, 2020, and changes during the three 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
Forfeited, cancelled or expired	(68,250	)	3.07
Outstanding at March 31, 2020	10,290,829		$	4.21	6.5	$	—
Options exercisable at March 31, 2020	9,900,705		$	4.35	6.4	$	—

The following table summarizes activity under our equity incentive plans related to the China Cash Bonuses as of March 31, 2020, and changes during the three 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	(114,500	)	5.40
Outstanding at March 31, 2020	973,000		$	5.18	5.3	$	—
Options exercisable at March 31, 2020	817,000		$	5.20	4.8	$	—